We can ignore the hydronium ion generated by second ionization.
Also: 7.1 x 10-4/0.050 x 100 = 1.4%
This value is < 5%, thus the assumption made in the analysis of the first
dissociation reaction is justified.
[Asc-2] = (Ka2 x HAsc-)/[H3O+] = 5 x 10-12 M
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