Benzoic acid (C₆H₅CO₂H = HBz)solutions are sometimes used in experiments to determine the molarity of a basic solution of unknown concentration.What is the pH of a 0.100 M solution of benzoic acid if K_a = 6.5 × 10^-5and the equilibrium equation of interest is HBz(aq)+ H₂O(l)⇌ H₃O⁺(aq)+ Bz^-(aq).

Question

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The correct answer is B because the pH of a 0.100 M solution of benzoic acid can be calculated using the equilibrium constant (Ka) and the equilibrium equation. The Ka value for benzoic acid is 6.5 × 10^-5, and the equilibrium equation is HBz(aq) + H2O(l) ⇌ H3O+(aq) + Bz-(aq). Using the Ka value and the equilibrium equation, we can calculate the concentration of H3O+ ions in the solution, which can then be used to calculate the pH.

Benzoic Acid (C6H5CO2H = HBz)solutions Are Sometimes Used in Experiments

Benzoic Acid (C₆H₅CO₂H = HBz)solutions Are Sometimes Used in Experiments