Chemistry

Chemistry

Problem

At 25∘C25^\circ\text{C}, benzoic acid has pKa=4.20pK_a = 4.20. Which statement correctly describes the relative concentrations of benzoic acid (C6H5COOH\mathrm{C_6H_5COOH}) and benzoate ion (C6H5COO−\mathrm{C_6H_5COO^-}) in an aqueous solution adjusted to pH=3.00pH = 3.00? a) [benzoic acid]=[benzoate ion][\text{benzoic acid}] = [\text{benzoate ion}] b) [benzoic acid]<[benzoate ion][\text{benzoic acid}] < [\text{benzoate ion}] c) [benzoic acid]>[benzoate ion][\text{benzoic acid}] > [\text{benzoate ion}] d) The predominant species cannot be predicted from the given information.

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