Question

At 298 K, nitrous acid (HNO2) dissociates in water with a Ka of 0.00071.

a)Calculate G° for the dissociation of HNO2. (Use Ka to calculate the answer.)

b) Calculate G if [H3O+] = 0.00070 M, [NO2 - ] = 0.16 M, and [HNO2 ] = 0.21 M.

Answer 1

DGo = -RTlnK, then
DG = DGo+RTlnK where you substitute concns for those materials making up Ka.