Arsenic acid (H3AsO4) is tripr

Author:

January 18th, 2023

Arsenic acid (H3AsO4) is triprotic, with Ka1=5.5 x 10-3 (10 tothe negative 3), Ka2=1.7 x 10-7(10 to the negative 7), and Ka3=5.1x 10-12 (10 to the negative 12). What is the pH of a 0.80 Msolution of arsenic acid.,

Answer:

concentration of arsenic acid = 0.80 M

H3AsO4 + H2O —————–>H2AsO4- + H3O+

0.80 0 0

0.80 -x x x

Ka1 = [H2AsO4-][H3O+] / [H3AsO4]

5.5 x 10^-3 = x^2 / 0.80 – x

x^2 + 5.5 x 10^-3 x – 4.4 x 10^-3 = 0

x = 0.0636

[H3O+] = 0.0636 M

pH = -log [H+] = -log (0.0636)

pH = 1.20

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