Answer:
The Equilibrium will shift to the left.
Explanation:
The reaction at equilibrium is as follow,
CH₃COOH ↔ CH3COO⁻ + H⁺
According to Le Chatelier's Principle," When a system (reaction) at equilibrium is subjected to any stress (like change in Concentration, Pressure, Temperature e.t.c) the system (reaction) tends to adjust itself in such a way so as to minimize the effect of that change".
Hence, in above reaction when Sodium Acetate (source of CH₃COO⁻) is added the equilibrium will shift in left side and will decrease the concentration of CH₃COO⁻ions.