Phosphoric acid (h3po4) has three acid dissociation constants (ka). the first dissociation constant has the greatest value, and it applies to the reaction described by which equation?

Question

Nathan Harvey

Chemistry

24 April, 19:04

Phosphoric acid (h3po4) has three acid dissociation constants (ka). the first dissociation constant has the greatest value, and it applies to the reaction described by which equation?

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Answers (1)

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Gillian Cherry · Answer 1

Missing question:

A. H3PO4 (aq) H + (aq) + H2PO4 - (aq).

B. H2PO4 - (aq) H + (aq) + H2PO4-^2 - (aq).

C. H3PO4 (aq) 2H + (aq) + HPO4^2 - (aq).

D. HPO4^2 - (aq) H + (aq) + PO4^3 - (aq).

Answer is: A. H3PO4 (aq) H + (aq) + H2PO4 - (aq).

The first dissociation constant : Ka₁ = [H+]·[H₂PO₄⁻] / [H₃PO₄ ].

In first dissociation phosphoric acid lost one proton (hydrogen ion).