Arsenic acid, H3AsO4, is used industrially to manufacture insecticides. Arsenic acid is a polyprotic acid with Ka1 = 2.5 × 10–4, Ka2 = 5.6 × 10–8, and Ka3 = 3 × 10–10. What is the pH of a solution whose initial arsenic acid concentration was 0.37 M?
Added by Peter B.
Step 1
Since the first ionization constant, Ka1, is much larger than Ka2 and Ka3, we can assume that the dominant ionization is the first one: H3AsO4 <=> H^+ + H2AsO4^- Show more…
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Arsenic acid, H3AsO4, is used industrially to manufacture insecticides. Arsenic acid is a polyprotic acid with K1 = 2.5 × 10-4, K2 = 5.6 × 10-8, and K3 = 3 × 10-13. What is the concentration of the HAsO42- in a solution whose initial arsenic acid concentration was 0.35 M?
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