Question

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?

Answer 1

Answer:

Explanation:

Step 1

Phosphoric Acid is a triprotic acid where H3PO4 dissociates to H2PO4- which then further dissociates HPO42- and it then forms PO43-. Equation for acid dissociation constant for the dissociation of H3PO4 and HPO42- can be written as above.

Step 2

Concentration of H2PO4- produces during the dissociation of H3PO4 can be determined by constructing an ICE table.

Step 3

Concentration of HPO42- produces during the dissociation of H2PO4- can be determined

Answer 2

Answer:

A. 4.2 × 10^-13

B. 0.024

C. Acidic

Explanation:

Below is an attachment containing the solution