Acetic Acid Dissolves in Water and Undergoes the Following Reaction $\rightarrow$

Acetic acid dissolves in water and undergoes the following reaction to increase the concentration of hydronium ions:
CH₃COOH (aq) $\rightarrow$ H₃O⁺ (aq) + CH₃COO^- (aq)
k₁Express the equilibrium constant in terms of the rate constants of this elementary process and its reverse.
H₃O⁺ (aq) + CH₃COO^- (aq) $\rightarrow$ CH₃COOH (aq) k_-1