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H2CrO4 is strong, or weak acid?
Quote from: Borek on December 02, 2007, 05:59:00 PMH2CrO4 is strong, or weak acid?H2CrO4 is a weak acid.
H2CrO4 is not so weak pKa ~ -1
At pH 4 HCrO4- dominates solution.
In low pH chromate is protonated, pushing dissolution equilibrium to the right. Nothing fancy, you are just removing one of the products (CrO42-) from the solution
2CrO42- + 2H3O+ <=> Cr2O72- + H2O
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