i) `H_3PO_(4(aq)) iff H^ _(aq)+ H_2PO_(4(aq))^-`
ii)`H_2PO_(4(aq))^- iff H^ +(aq)+ H_2PO_(4(aq))^(2-)` .
iii) `H_2PO_(4(aq))^(2-) iff H^ +(aq)+ PO_(4(aq))^(3-)` . The equilibrium constantsfor the above reactions at a certain temperature are `K_1, K_2 and K_3` respectively. The equilibrium constant for the reaction. `H_3PO_4(aq) iff 3H^ +(aq)+ PO_(4(aq))^(3-)` in terms `K_1, K_2 and K_3` is

Options

A. `K_1 + K_2 + K_3 `
B. `K_1/(K_2 +K_3)`
C. `K_3/(K_1K_2)`
D. `K_1, K_2 and K_3 `

Answer

D

Explanation

Answer(4) The equilibrium constant for the reaction, `H_3PO_4 (aq) iff 3H^+ (aq) + PO^-3_4 (aq) is k_1, k_2, k_3`