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CSU CHEM 113 - Polyprotic Acids

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Chem 113 1st Edition Lecture 28 Outline of Last Lecture I. The Acid Dissociation Constant KaII. Percent ionizationIII. The Base Dissociation Constant KbIV. Aqueous Solutions of AmmoniaOutline of Current Lecture I. Polyprotic AcidsII. Strengths of conjugate acid-base pairsCurrent LectureI. Polyprotic Acidsa. A polyprotic acid is an acid with more than one ionizable protonb. In a solution, each dissociation step has a different value for Kai. Usually neglect [H3O+] produced after the first dissociation1. The exception is H2SO4, at Ka1>>1, Ka2=1.2x10-22. Second ionizations aren’t usually a significant source of H3O+These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.II. Strengths of conjugate acid-base pairsa. Salts of F- will increase [OH-] resulting in a pH>7i. Salts of these species can affect the pH of aqueous solutionsb. Salts of NH4+ will increase [H3O+] resulting in a


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CSU CHEM 113 - Polyprotic Acids

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