Use k1 and solve for (H^+) = (H2AsO4^-)
Use k2 to solve for (HAsO4^2-)
Use k3 and your numbers from 1 and 2 to solve for AsO4^3-. Note: you may need to use a quadratic for the first part (k1). Post any work if you get stuck.
What is the concentration of arsenate ions in 3.5 M solution of arsenic acid?
The acid-dissociation constants of H3AsO4 are:
Ka1 = 5.0 x 10-3
Ka2 = 9.3 x 10-8
Ka3 = 3.0 x 10-12
I can't figure out how to set up the question
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