What is the pH of a 0.250 M solution of formic acid? Ka = 1.8 × 10^-4

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Quizplus · Accepted Answer

The pH of a weak acid solution can be calculated using the formula pH = -log[H+], where [H+] is the concentration of hydrogen ions. For formic acid, [H+] can be approximated using the formula [H+] = √(Ka × [HA]), where [HA] is the concentration of the acid. Substituting the given values, [H+] = √(1.8 × 10^-4 × 0.250) ≈ 0.0067 M, and pH = -log(0.0067) ≈ 2.2.

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