Question

Write an equilibrium expression for each chemical equation involving one or more solid or liquid reactants or products.
HCHO2(aq)+H2O(l)⇌H3O+(aq)+CHO−2(aq)
Use A for [HCHO2], B for [H2O], C for [H3O+], D for [CHO−2].

Answer 1

So the equation transformed to the letters is
A(aq) + B(l) ==> C(aq) + D(aq)

The whole point of this problem is that when writing equilibrium constants one does NOT include pure liquids or solids so
Keq for this one is (C)(D)/(A)

Answer 2

kough