Chemistry Help Please!!

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How can you precipitate BaCrO4(s) from a solution of barium nitrate and potassium dichromate? I don't get it.. it's a question from a lab we did on chromate-dichromate equilibrium.

  • Chemistry Help Please!! -

    There is an equilibrium represented as follows:
    2CrO4^2- + 2H^+ ==> Cr2O7^2- + H2O
    So in acid solution the Cr2O7^2- predominates and in neutral or basic solution the CrO4^2- is the main ion.
    Barium ion forms a ppt with CrO4^2- but not with Cr2O7^2-. So to get BaCrO4 you are depending upon the equilibrium conditions to help you get enough CrO4^2- to exceed the Ksp of BaCrO4.

  • Chemistry Help Please!! -

    Thank you! :D

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