HClO2 ------------------------> H+ + ClO2-
0.01 0 0 -----------> I
-x + x +x ----------> C
0.01-x x x ---------> E
Ka = x^2 / 0.01-x = 1.10 x 10^-2
x^2 + 1.10 x 10^-2 x - 1.10 x 10^-4 = 0
x = 6.34 x 10^-3
[H+] = 6.34 x 10^-3 M
pH = -log [H+]
pH = -log ( 6.34 x 10^-3 )
pH = 2.20
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