The equilibrium constant could be found using the relationship Kaq = [H^+] [HCOO-]/HCOOH
The equilibrium constant is a value that shows us the extent to which reactants are converted into products. We know that a very high value of the equilibrium constant implies that the reactants are mostly converted into products.
Now we have the equation of the reaction as; HCOOH(aq)⇌H^+(aq) + 〖HCOO〗^- (aq). The equilibrium constant ca now be written in terms of Kaq.
Thus the equilibrium constant is;
Kaq = [H^+] [HCOO-]/HCOOH
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