Calculate the pH of a 0.100M NaOCl salt solution. Ka for hypochlorous acid, HOCl, is 3.5x10-8

Expert Solution

concentration of NaOCl = 0.100 M

Ka of HOCl = 3.5 x 10^-8

Kb = 2.857 x 10^-7

OCl- + H2O ----------------> HOCl + OH-

0.1 0 0

0.10 - x x x

Kb = x^2 / 0.1 - x

2.857 x 10^-7 = x^2 / 0.1 - x

x = 1.689 x 10^-4

[OH-] = 1.689 x 10^-4 M

pOH = -log (1.689 x 10^-4 ) = 3.77

pH = 10.23

queen_honey_blossom answered 2 years ago

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