27. A 0.250 M solution of HCIO2 has a measured pH of 3.40. What is the...

Question

Question

Answer 1

Answer #1

HClO₂ is a weak acid and hence

pH = 1/2 pK_a - 1/2 log C_H⁺

Or, 1/2 pK_a = pH + 1/2 logC_H⁺

Or, 1/2 pK_a = 3.40 + 1/2 log 0.25 (as C_H⁺ = 0.25M)

Or, 1/2 pK_a = 3.40 +1/2 *(-0.602059)

= 3.40 - 0.30103

= 3.09897

Or, pK_a = 6.19794

Or, -log K_a = 6.19794

Or K_a = 10^-6.19794

= 6.34 * 10^-7 (Answer)

Answer 2

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