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 Acid base reactions https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:acids-and-bases/x2eef969c74e0d802:acidbase-reactions/v/weak-acid-strong-base-reactions 2022-10-05T02:43:18.611402953Z Weak acid–strong base reactions When a weak acid and a strong base are mixed, they react according to the following net-ionic equation: HA(aq) + OH⁻(aq) → A⁻(aq) + H₂O(l). If the acid and base are equimolar, the pH of the resulting solution can be determined by considering the equilibrium reaction of A⁻ with water. If the acid is in excess, the pH can be determined from the concentrations of HA and A⁻ after the reaction. If the base is in excess, the pH can be determined from the concentration of excess OH⁻. Jay video https://cdn.kastatic.org/ka_thumbnails_cache/d4084b90-9dce-4cb5-90d5-9de350fecd12_1280_720_base.png Weak acid–strong base reactions When a weak acid and a strong base are mixed, they react according to the following net-ionic equation: HA(aq) + OH⁻(aq) → A⁻(aq) + H₂O(l). If the acid and base are equimolar, the pH of the resulting solution can be determined by considering the equilibrium reaction of A⁻ with water. If the acid is in excess, the pH can be determined from the concentrations of HA and A⁻ after the reaction. If the base is in excess, the pH can be determined from the concentration of excess OH⁻. https://cdn.kastatic.org/ka-youtube-converted/VdAl4QK4-0Q.mp4/VdAl4QK4-0Q.mp4 482 Acid base reactions https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:acids-and-bases/x2eef969c74e0d802:acidbase-reactions/v/worked-example-calculating-the-ph-after-a-weak-acid-strong-base-reaction-excess-acid 2022-10-05T02:43:18.611402953Z Worked example: Calculating the pH after a weak acid–strong base reaction (excess acid) When a strong base reacts with excess weak acid, the resulting solution contains both HA and A⁻. We can use reaction stoichiometry to determine the concentration of each species and then solve a common-ion equilibrium problem to find [H₃O⁺] and thus the pH. Jay video https://cdn.kastatic.org/ka_thumbnails_cache/e5576b53-2b38-40f5-8df0-132dc7cf20a0_1280_720_base.png Worked example: Calculating the pH after a weak acid–strong base reaction (excess acid) When a strong base reacts with excess weak acid, the resulting solution contains both HA and A⁻. We can use reaction stoichiometry to determine the concentration of each species and then solve a common-ion equilibrium problem to find [H₃O⁺] and thus the pH. https://cdn.kastatic.org/ka-youtube-converted/9rRlLPx6w7M.mp4/9rRlLPx6w7M.mp4 544 Acid base reactions https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:acids-and-bases/x2eef969c74e0d802:acidbase-reactions/v/weak-acid-weak-base-reactions 2022-10-05T02:43:18.611402953Z Weak acid–weak base reactions When a weak acid and a weak base are mixed, they come to an equilibrium state represented by the following equation: HA(aq) + B(aq) ⇌ A⁻(aq) + HB⁺(aq). The equilibrium position lies on the side of the weaker acid and the weaker base, and we can determine whether the resulting solution is acidic, basic, or neutral by comparing the Ka and Kb values of these species. Jay video https://cdn.kastatic.org/ka_thumbnails_cache/49a56cc8-4078-4ea8-aad9-8411dbd80e04_1280_720_base.png Weak acid–weak base reactions When a weak acid and a weak base are mixed, they come to an equilibrium state represented by the following equation: HA(aq) + B(aq) ⇌ A⁻(aq) + HB⁺(aq). The equilibrium position lies on the side of the weaker acid and the weaker base, and we can determine whether the resulting solution is acidic, basic, or neutral by comparing the Ka and Kb values of these species. https://cdn.kastatic.org/ka-youtube-converted/G5FVxAzlmfM.mp4/G5FVxAzlmfM.mp4 431 Acid base reactions https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:acids-and-bases/x2eef969c74e0d802:acidbase-reactions/v/weak-base-strong-acid-reactions 2022-10-05T02:43:18.611402953Z Weak base–strong acid reactions When a weak base and a strong acid are mixed, they react according to the following net-ionic equation: B(aq) + H₃O⁺(aq) → HB⁺(aq) + H₂O(l). If the acid and base are equimolar, the pH of the resulting solution can be determined by considering the equilibrium reaction of HB⁺ with water. If the base is in excess, the pH can be determined from the concentrations of B and HB⁺ after the reaction. If the acid is in excess, the pH can be determined from the concentration of excess H₃O⁺. Jay video https://cdn.kastatic.org/ka_thumbnails_cache/06047936-f571-4910-9d6d-c406d828306f_1280_720_base.png Weak base–strong acid reactions When a weak base and a strong acid are mixed, they react according to the following net-ionic equation: B(aq) + H₃O⁺(aq) → HB⁺(aq) + H₂O(l). If the acid and base are equimolar, the pH of the resulting solution can be determined by considering the equilibrium reaction of HB⁺ with water. If the base is in excess, the pH can be determined from the concentrations of B and HB⁺ after the reaction. If the acid is in excess, the pH can be determined from the concentration of excess H₃O⁺. https://cdn.kastatic.org/ka-youtube-converted/78Sg3RdEPVk.mp4/78Sg3RdEPVk.mp4 388 Acid base reactions https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:acids-and-bases/x2eef969c74e0d802:acidbase-reactions/e/acid-base-reactions 2025-02-05T10:28:14.374739025Z Acid–base reactions Check your understanding of acid–base reactions in this set of free practice questions designed for AP Chemistry students. exercise https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:chemical-reactions/x2eef969c74e0d802:introduction-to-acid-base-reactions/e/introduction-to-acid-base-reactions 2021-07-08T05:13:16Z Introduction to acid–base reactions Check your understanding of Brønsted–Lowry acids, bases, and conjugate acid–base pairs in this set of free practice questions designed for AP Chemistry students. exercise