Answer: CH₃COONa.
- A NH₄Cl
- B NaCl
- C CH₃COONa
- D NaNO₃
Correct answer: C. CH₃COONa
Explanation: CH₃COONa is a salt of weak acid and strong base. The acetate ion hydrolyses to give OH⁻, making the solution alkaline.
As the reaction proceeds, reactant concentration falls and product concentration rises until both level off at equilibrium.
Concept context
When forward and reverse reaction rates are equal, equilibrium is reached. Learn about Kc, Kp, Le Chatelier's principle, and acid-base equilibria, including pH, buffer solutions, and solubility product.