1)Calculate the pH of a 0.200M solution of arsenic acid, H3AsO4.

1)Calculate the pH of a 0.200M solution of arsenic acid, H₃AsO₄.

Expert Solution

H3AsO4 ----------------------> H+ + H2AsO4-

0.200 0 0

-x + x + x

0.2-x x x

Ka = x^2 / 0.2-x = 5.5 x 10^-3

x^2 + 5.5 x 10^-3 x - 1.1 x 10^-3 = 0

x = 0.0305

[H+] = 0.0305 M

pH = -log [0.0305]

pH = 1.52

queen_honey_blossom answered 2 years ago

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