https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/v/common-properties-of-acidbases-and-ph-importance 2026-04-29T07:20:45.495372596Z Common properties of acidbases and pH importance Common properties of acidbases and pH importance Khan Academy Pakistan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Common properties of acidbases and pH importance Common properties of acidbases and pH importance https://cdn.kastatic.org/ka-youtube-converted/1JnsxruTkCQ.mp4/1JnsxruTkCQ.mp4 395 The characteristic properties of acids and bases https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/v/ph-change-and-the-concentration-of-hoh 2026-04-29T07:20:45.495372596Z pH change and the concentration of H+OH pH change and the concentration of H+OH Khan Academy Pakistan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw pH change and the concentration of H+OH pH change and the concentration of H+OH https://cdn.kastatic.org/ka-youtube-converted/kQwvdC7leT0.mp4/kQwvdC7leT0.mp4 386 The characteristic properties of acids and bases https://www.khanacademy.org/science/biology/water-acids-and-bases/acids-bases-and-ph/v/arrhenius-definition-of-acids-and-bases 2021-03-18T10:33:22Z Arrhenius acids and bases Arrhenius definition of acids and bases. video https://cdn.kastatic.org/googleusercontent/a_GljFGSiDfy3QvzGK82CuCMIpl6itDLMKPD_IA3BomswmLzIRm3-0O3mkJQA7WAZbK5a2tzZuzEPiXUgLAd-jt4 Arrhenius acids and bases Arrhenius definition of acids and bases. https://cdn.kastatic.org/ka-youtube-converted/Y4HzGldIAss.mp4/Y4HzGldIAss.mp4 470 The characteristic properties of acids and bases https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:solutions-acids-and-bases/x2613d8165d88df5e:intro-to-acids-and-bases/v/intro-to-acids-and-bases 2024-09-13T21:44:04.582261351Z Intro to acids and bases Acids and bases can be described using the Arrhenius model: acids produce H+ ions in aqueous solutions, while bases produce OH- ions. We can identify acidic and basic solutions using their distinct and often contrasting properties, some of which you are likely familiar with! The strength of an acid or base can also vary and depends on how much it dissociates in solution. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/5a5cdb71-cf0d-4b30-9fa6-cc28b6b0a3cc_1280_720_base.png Intro to acids and bases Acids and bases can be described using the Arrhenius model: acids produce H+ ions in aqueous solutions, while bases produce OH- ions. We can identify acidic and basic solutions using their distinct and often contrasting properties, some of which you are likely familiar with! The strength of an acid or base can also vary and depends on how much it dissociates in solution. https://cdn.kastatic.org/ka-youtube-converted/ja7p_tzTTEA.mp4/ja7p_tzTTEA.mp4 733 The characteristic properties of acids and bases https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/a/arrhenius-acids-and-bases 2021-06-28T16:23:29Z Arrhenius acids and bases Definition of Arrhenius acids and bases, and Arrhenius acid-base reactions  article https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:solutions-acids-and-bases/x2613d8165d88df5e:intro-to-acids-and-bases/e/understand-intro-to-acids-and-bases 2026-04-28T11:00:37.315336883Z Understand: Intro to acids and bases Check your understanding of properties of acids and bases in this set of free, standards-aligned practice questions. Donna Fig exercise https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:solutions-acids-and-bases/x2613d8165d88df5e:intro-to-acids-and-bases/e/apply-intro-to-acids-and-bases 2026-04-28T11:00:37.315336883Z Apply: Intro to acids and bases Apply your understanding of the properties of acids and bases in this set of free practice questions. Donna Fig exercise https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:solutions-acids-and-bases/x2613d8165d88df5e:intro-to-acids-and-bases/a/writing-formulas-and-names-for-acids-and-bases 2026-04-28T11:00:37.315336883Z Learn: Naming acids and bases Learn how to write the formulas and names for common acids and bases. article https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:chemical-reactions/x2eef969c74e0d802:introduction-to-acid-base-reactions/v/bronsted-lowry-definition-of-acids-and-bases 2021-06-24T11:08:04Z Brønsted–Lowry acids and bases In the Brønsted–Lowry definition of acids and bases, an acid is a proton (H⁺) donor, and a base is a proton acceptor. When a Brønsted–Lowry acid loses a proton, a conjugate base is formed. Similarly, when a Brønsted–Lowry base gains a proton, a conjugate acid is formed. A Brønsted–Lowry acid (or base) and its conjugate base (or acid) are known as a conjugate acid–base pair. Sal Khan video https://cdn.kastatic.org/googleusercontent/qNA4B6_veuFHcRuwMEykr_evFFehJCPcikGKiQZPpEHdbCzHLDT3StVYJhIj5UFXD-Vubr7iV7Eh2xEJBz8amJA Brønsted–Lowry acids and bases In the Brønsted–Lowry definition of acids and bases, an acid is a proton (H⁺) donor, and a base is a proton acceptor. When a Brønsted–Lowry acid loses a proton, a conjugate base is formed. Similarly, when a Brønsted–Lowry base gains a proton, a conjugate acid is formed. A Brønsted–Lowry acid (or base) and its conjugate base (or acid) are known as a conjugate acid–base pair. https://cdn.kastatic.org/ka-youtube-converted/XVOU9c3crbc.mp4/XVOU9c3crbc.mp4 537 The characteristic properties of acids and bases https://www.khanacademy.org/science/organic-chemistry/organic-structures/acid-base-review/v/acid-base-lewis-bronsted-lowry 2021-03-22T03:07:30Z Acid-base definitions Bronsted-Lowry and Lewis definitions of acids and bases. Jay video https://cdn.kastatic.org/googleusercontent/Kv-qFzxWWo18554uoBZOASW9iZahjGovuoHIGsIURqE7RKWM_xhMN0N0cPB57ixkhT_dlJYlG8p35Lx6wAgKlQ5_ Acid-base definitions Bronsted-Lowry and Lewis definitions of acids and bases. https://cdn.kastatic.org/ka-youtube-converted/diCb6JkLlQE.mp4/diCb6JkLlQE.mp4 511 The characteristic properties of acids and bases https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/v/metal-and-non-metal-oxides-reacting-with-acids-and-bases-pk 2025-12-18T18:40:53.641757593Z Metal and non metal oxides, reacting with acids and bases Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Metal and non metal oxides, reacting with acids and bases Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/X8qqwbTGIGk.mp4/X8qqwbTGIGk.mp4 460 The characteristic properties of acids and bases https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/e/acids-and-bases 2021-04-29T07:52:16Z Definition of acids and bases Let's practice the questions which helps to learn the definition of acids and bases. Chaitra exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:metals/x8bc8fb44369617ed:properties-of-metals/v/metals-reacting-with-water-pk 2025-12-18T18:40:53.641757593Z Metals reacting with water Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Metals reacting with water Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/MlSmof_sPzY.mp4/MlSmof_sPzY.mp4 646 The characteristic properties of acids and bases https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:solutions-acids-and-bases/x2613d8165d88df5e:intro-to-acids-and-bases/e/naming-acids-and-bases 2026-04-29T07:20:45.495372596Z Apply: Naming acids and bases Apply your understanding of naming acids and bases in this set of free, standards-aligned practice questions. Donna fig exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/e/bronsted-lowry-concept-of-acids-and-bases 2025-02-05T10:28:14.374739025Z Bronsted-Lowry concept of acids and bases Exercise on understanding the Bronsted-Lowry concept of acids and bases exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/v/reaction-of-acids-bases-ur 2025-08-08T00:50:08.705567982Z Reaction of acids & bases Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Reaction of acids & bases Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/BOOxK88bxpY.mp4/BOOxK88bxpY.mp4 598 The characteristic properties of acids and bases https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/v/reaction-of-acids-and-bases-with-metals-pk 2025-12-18T16:50:45.096818701Z Reaction of acids and bases with metals Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Reaction of acids and bases with metals Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/WbSkLjK4UX0.mp4/WbSkLjK4UX0.mp4 427 The characteristic properties of acids and bases https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/e/overview-reactions-of-acids-and-bases 2026-03-28T11:26:53.640553555Z Overview: Reactions of acids and bases Let's practice identifying the products formed when acids and bases react with metals, metal carbonates, and metal bicarbonates. exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/v/reaction-of-acids-with-metal-carbonates-and-bicarbonates-pk 2025-12-18T16:50:45.096818701Z Reaction of acids with metal carbonates and bicarbonates Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Reaction of acids with metal carbonates and bicarbonates Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/h5KdVbNVq8o.mp4/h5KdVbNVq8o.mp4 364 The characteristic properties of acids and bases https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/e/acids-bases-and-salts-in 2026-04-07T22:59:30.107127435Z Acids, Bases and Salts Let's practice vibhor exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/e/identify-the-salt-formed 2026-03-06T15:40:42.486549694Z Identify the salt formed Let's practice identifying the salt formed in reactions, where acids react with metals, metal carbonates/bicarbonates, and bases. Let's also identify the salts formed when carbon dioxide has is passed into lime water. exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/e/identifying-the-gas-released 2021-04-29T07:51:19Z Identifying the gas released Let's practice identifying the gas released when a metal reacts with an acid, a base, a carbonate, or a bicarbonate compound. Chaitra exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/e/detection-of-gases 2026-03-06T15:30:48.082757719Z Detection of gases Let's practice to detect the presence of hydrogen and carbon dioxide gases by solving chemical reactions. exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/v/neutralization-reaction-acid-base-reactions 2026-04-15T09:00:48.368849752Z Neutralization Reaction - Acid base reactions Neutralization Reaction Khan Academy Pakistan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Neutralization Reaction - Acid base reactions Neutralization Reaction https://cdn.kastatic.org/ka-youtube-converted/BTyQoUtAlpE.mp4/BTyQoUtAlpE.mp4 376 The characteristic properties of acids and bases https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/v/acid-base-neutralisation-reaction-pk 2025-12-18T16:50:45.096818701Z Acid base neutralisation reaction Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Acid base neutralisation reaction Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/ItYFQyPE6mI.mp4/ItYFQyPE6mI.mp4 461 The characteristic properties of acids and bases https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:acids-and-bases/x2eef969c74e0d802:acidbase-reactions/v/strong-acid-strong-base-reactions 2022-10-05T02:43:18.611402953Z Strong acid–strong base reactions When a strong acid and a strong base are mixed, they react according to the following net-ionic equation: H₃O⁺(aq) + OH⁻(aq) → 2H₂O(l). If either the acid or the base is in excess, the pH of the resulting solution can be determined from the concentration of excess reactant. If the acid and base are equimolar, the pH of the solution is 7.00 at 25°C. Jay video https://cdn.kastatic.org/ka_thumbnails_cache/bc981dcb-3e66-4cf0-8606-eb4f5f9084dc_1280_720_base.png Strong acid–strong base reactions When a strong acid and a strong base are mixed, they react according to the following net-ionic equation: H₃O⁺(aq) + OH⁻(aq) → 2H₂O(l). If either the acid or the base is in excess, the pH of the resulting solution can be determined from the concentration of excess reactant. If the acid and base are equimolar, the pH of the solution is 7.00 at 25°C. https://cdn.kastatic.org/ka-youtube-converted/SttbEmGj9uM.mp4/SttbEmGj9uM.mp4 569 The characteristic properties of acids and bases https://www.khanacademy.org/science/bridge-course-class-10th-science/x37589313f9a4c197:week-1/x37589313f9a4c197:neutralisation-reaction/e/neutralization-reactions 2026-04-21T09:50:34.424034119Z Neutralization Reactions Lets answer some questions. Shankar R exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/v/litmus-solution-natural-indicator-ur 2025-08-08T00:50:08.705567982Z Litmus solution (Natural indicator) Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Litmus solution (Natural indicator) Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/1ottaViMpg0.mp4/1ottaViMpg0.mp4 614 The characteristic properties of acids and bases https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/v/litmus-paper-as-an-indicator-ur 2025-08-08T00:50:08.705567982Z Litmus paper as an Indicator Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Litmus paper as an Indicator Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/7aNLKOy5m2w.mp4/7aNLKOy5m2w.mp4 302 The characteristic properties of acids and bases https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/e/indicators 2025-04-06T05:39:20.526945352Z Indicators Lets answer some questions! revathy exercise https://www.khanacademy.org/science/bridge-course-class-10th-science/x37589313f9a4c197:week-1/x37589313f9a4c197:acids-bases-and-salts/e/litmus-test 2026-03-06T14:50:39.290513618Z Litmus test Let's practice problems involving testing whether a given substance is acidic or basic using litmus solution. Chaitra exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/e/phenolphthalein-and-methyl-orange-test 2026-03-06T15:00:39.647216277Z Phenolphthalein and methyl orange test Let's practice problems involving testing whether a given substance is acidic or basic using phenolphthalein and methyl orange indicators. exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/v/strong-and-weak-acids-bases-pk 2025-12-18T16:50:45.096818701Z Strong and weak acids/bases Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Strong and weak acids/bases Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/tZ7stSmlx0w.mp4/tZ7stSmlx0w.mp4 316 The characteristic properties of acids and bases https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:acids-and-bases/x2eef969c74e0d802:weak-acid-and-base-equilibria/v/weak-acid-equilibria 2022-10-05T02:43:18.611402953Z Weak acid equilibria Unlike strong acids, weak acids only partially ionize in aqueous solution. As a result, the concentration of H₃O⁺ in a weak acid solution is typically much less than the initial acid concentration. The relative strength of a weak acid is described by the acid ionization constant, Kₐ, which is the equilibrium constant for the reaction of the weak acid with water. Jay video https://cdn.kastatic.org/ka_thumbnails_cache/bae31433-023c-4c59-a7c1-360d5c111365_1280_720_base.png Weak acid equilibria Unlike strong acids, weak acids only partially ionize in aqueous solution. As a result, the concentration of H₃O⁺ in a weak acid solution is typically much less than the initial acid concentration. The relative strength of a weak acid is described by the acid ionization constant, Kₐ, which is the equilibrium constant for the reaction of the weak acid with water. https://cdn.kastatic.org/ka-youtube-converted/nJLNlB-7Rhk.mp4/nJLNlB-7Rhk.mp4 670 The characteristic properties of acids and bases https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/e/identifying-weak-acids-and-strong-acids-exercise 2021-06-28T16:41:02Z Identifying weak acids and strong acids Practice identifying weak acids and strong acids Yuki exercise https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:acids-and-bases/x2eef969c74e0d802:ph-and-poh-of-strong-acids-and-bases/v/strong-base-solutions 2022-09-05T08:18:59.810508578Z Strong base solutions Strong bases (such as Group 1 and 2 metal hydroxides) dissociate completely in water to produce hydroxide ions. The concentration of OH⁻ in a strong base solution can therefore be determined from the initial concentration of the base and the stoichiometry of the dissolution. For example, the strong base Ba(OH)₂ dissociates to give two OH⁻ ions per formula unit, so a 0.1 M Ba(OH)₂ solution has an OH⁻ concentration of 0.2 M. Jay video https://cdn.kastatic.org/ka_thumbnails_cache/f7ff042c-9085-4e42-a9b3-f1f8a5c76307_1280_720_base.png Strong base solutions Strong bases (such as Group 1 and 2 metal hydroxides) dissociate completely in water to produce hydroxide ions. The concentration of OH⁻ in a strong base solution can therefore be determined from the initial concentration of the base and the stoichiometry of the dissolution. For example, the strong base Ba(OH)₂ dissociates to give two OH⁻ ions per formula unit, so a 0.1 M Ba(OH)₂ solution has an OH⁻ concentration of 0.2 M. https://cdn.kastatic.org/ka-youtube-converted/ffAiM67QomI.mp4/ffAiM67QomI.mp4 327 The characteristic properties of acids and bases https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:solutions-acids-and-bases/x2613d8165d88df5e:intro-to-acids-and-bases/v/introduction-to-ph 2024-03-19T21:01:49.527176433Z Introduction to pH The pH scale is used to determine the acidity or basicity (alkalinity) of a substance. Acidic substances have pH values below 7, while basic substances have pH values above 7; neutral substances have a pH of 7. The pH scale is logarithmic, so each step represents a 10-fold change in concentration. Sal Khan video https://cdn.kastatic.org/googleusercontent/gH1DSPb-1zyfV6R9fjXld5DWVrmXbb1QVDaBRbvhapDJeuGGoBMuUBLYLYVUr1moO0mQnXTiJqy4oZGuifwVeio Introduction to pH The pH scale is used to determine the acidity or basicity (alkalinity) of a substance. Acidic substances have pH values below 7, while basic substances have pH values above 7; neutral substances have a pH of 7. The pH scale is logarithmic, so each step represents a 10-fold change in concentration. https://cdn.kastatic.org/ka-youtube-converted/oda2K4IFBaE.mp4/oda2K4IFBaE.mp4 322 The characteristic properties of acids and bases https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/e/ph-and-strength 2021-04-29T07:49:52Z Effect of pH on strength of acids and bases Let's practice finding the strength of the solution given pH values. Chaitra exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/e/ph-and-ph-scale 2026-03-07T04:41:01.851344552Z Identify the nature of a substance based on pH (BASIC) Let's learn about pH and pH scale Chaitra exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/e/ph--concentration 2021-04-29T08:02:07Z Effect of concentration on pH change Let's practice questions involving relationship between pH and concentration of H+ ions. Chaitra exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/e/common-properties-of-acids-and-bases-importance-of-ph 2026-04-07T22:59:30.107127435Z Common properties of acids and bases + Importance of pH Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/v/the-ph-scale-ms 2025-05-07T17:11:10.976262835Z The pH scale pH measures how acidic or basic a solution is based on the relative amount of charged hydrogen atoms (H⁺) present. The pH scale ranges from 0 to 14, with acids below 7, bases above 7, and neutral substances equal to 7. Indicators like litmus paper and universal indicator help determine pH by changing color based on the solution’s acidity or basicity. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/3a73a235-4d37-4b75-b9a8-9d22cb8ef5e0_1280_720_base.png The pH scale pH measures how acidic or basic a solution is based on the relative amount of charged hydrogen atoms (H⁺) present. The pH scale ranges from 0 to 14, with acids below 7, bases above 7, and neutral substances equal to 7. Indicators like litmus paper and universal indicator help determine pH by changing color based on the solution’s acidity or basicity. https://cdn.kastatic.org/ka-youtube-converted/qCDSfihEhno.mp4/qCDSfihEhno.mp4 464 The characteristic properties of acids and bases https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:solutions-acids-and-bases/x2613d8165d88df5e:intro-to-acids-and-bases/e/apply-the-ph-scale 2026-04-28T11:00:37.315336883Z Apply: The pH scale Apply your understanding of acids, bases, and the pH scale in this set of free, standards-aligned practice questions. Donna Fig exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/a/hs-ph-acids-and-bases-review 2021-04-29T07:52:49Z pH, acids, and bases review article https://www.khanacademy.org/science/biology/water-acids-and-bases/acids-bases-and-ph/a/acids-bases-ph-and-bufffers 2021-04-29T07:49:51Z Acids, bases, pH, and buffers Acidity and basicity, proton concentration, the pH scale, and buffers. article https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:the-characteristic-properties-of-acids-and-bases/e/apply-acids-and-bases 2025-08-07T16:33:23.527416765Z Apply: acids and bases Apply your understanding of acids, bases, and the pH scale solutions in this set of free, standards-aligned practice questions. donna exercise