Write the ka expression for h2po4 - in water. click in the answer box to activate the palette.

Balanced chemical reaction: H₂PO₄⁻ (aq) + H₂O (l) ⇄ HPO₄²⁻ (aq) + H₃O⁺ (aq).

or H₂PO₄⁻ (aq) ⇄ HPO₄²⁻ (aq) + H⁺ (aq).

Ka is the acid dissociation constant, which quantifies the extent of acid dissociation (in this example H₂PO₄⁻) in water.

Ka = [HPO₄²⁻]·[H₃O⁺] / [H₂PO₄⁻].

or Ka = [HPO₄²⁻]·[H⁺] / [H₂PO₄⁻].