Phosphoric acid is a triprotic acid with the follow Ka values: Ka1 = 7.2x10−3, Ka2 = 6.3x10−8, Ka3 = 4.2x10−13 Based on this information, What is the Ka of HPO42-? What is the Kb of HPO42-? Is HPO42- acidic, basic, or neutral?

A. 4.2 × 10^-13

B. 0.024

C. Acidic

Explanation:

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the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.