1 answer

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

Question:







27. A 0.250 M solution of HCIO2 has a measured pH of 3.40. What is the Ka for this acid? Show all work for full credit. (6 pt
27. A 0.250 M solution of HCIO2 has a measured pH of 3.40. What is the Ka for this acid? Show all work for full credit. (6 pts)

Answers

HClO2 is a weak acid and hence

pH = 1/2 pKa - 1/2 log CH+

Or, 1/2 pKa = pH + 1/2 logCH+

Or, 1/2 pKa = 3.40 + 1/2 log 0.25 (as CH+ = 0.25M)

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

= 3.40 - 0.30103

= 3.09897

Or, pKa = 6.19794

Or, -log Ka = 6.19794

Or Ka = 10-6.19794

     = 6.34 * 10-7 (Answer)

.

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