Please help..Write the equation for the equilibrium constant (K) of the reaction.

Question

2K2CrO4 + 2HCl --><-- Cr2O7 + H2O + 2KCl

(K2CrO4 is chromate) and (Cr2O7 is dichromate)

Answer 1

Your equation isn't balanced. I would write the net ionic equation as
2CrO4^2- + 2H^+ ==> Cr2O7^2- + H2O

Keq = (Cr2O7^2-)/(H^+)^2(CrO4^2-)^2

If you want to keep your equation molecular I would balance it this way.
2K2CrO4 + 2HCl ==> K2Cr2O7 + H2O + 2KCl