General Chemistry 4th Editon University Science Books presented Sapling Learing

Question

General Chemistry 4th Editon University Science Books presented Sapling Learing Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.200 M Hclo(aq) 0.200 The lonization comestant for HCIO can be found here, Number (a) before addition of any KOH Number (b) after addition of 25.0 mL of KOH Number (c) after addition of 35.0 mL of KoH Number (d) after addition of 50.0 mL of KOH Number (e) after addition of 60.0 mL of KoH un 8 view solution Check Answer Next Exit G Previous G Hint

Explanation / Answer

Ka = 2.9 * 10-8

intial [HClO] = 0.2 M

HClO <-------> H+ + ClO-

HClO H+ ClO-

Intial 0.2 - -

Converted -x x x

Equilibrium 0.2-x x x

Ka = x*x / (0.2-x) =  2.9 * 10-8

x = 7.61 * 10-5

[H+] = 7.61 * 10-5 (mol/L)

pH = - log ([H+]) = -log(7.61 * 10-5 ) = 4.12 before addition of KOH

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