The pH value of CH₃COOH solution is 2.3 and the pH value of NH solution is 13. How does the change change if we mix 3 mL of the acetic acid with 3 mL of 1 M CH₃COONa and 3 mL of 0.1 M NH solution with 3 mL of 0.1 M ammonium chloride solution? Please write reactions of dissociation and expression for the equilibrium constant. How does the dissociation degree of CH₃CO₂H and NH₃ change after addition of relevant salt?