https://www.khanacademy.org/science/grade-8-science-tx/x3cd7525f789ab4f1:properties-of-water/x3cd7525f789ab4f1: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 pH 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 pH https://www.khanacademy.org/science/grade-9-chemistry-snc-aligned/x22d5b83c2ea2dc38:acid-base-chemistry/x22d5b83c2ea2dc38: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/hs-chemistry/x2613d8165d88df5e:solutions-acids-and-bases/x2613d8165d88df5e:intro-to-acids-and-bases/e/apply-the-ph-scale 2026-04-07T22:23:57.656416987Z 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/up-class-10th-science/x5d08d26681869997:acids-bases-and-salts/x5d08d26681869997:common-features-of-acid-and-base/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