Answer: log([salt]/[acid]).
- A log([acid]/[salt])
- B log([salt]/[acid])
- C the ratio [salt]/[acid]
- D the value of pKa
Correct answer: B. log([salt]/[acid])
Explanation: pH = pKa + log([salt]/[acid]); equal salt and acid concentrations give pH = pKa.
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.