Question about chromate-dichromate equilibrium?

  1. May 6, 2009 #1
    Ok so when i add HCl to a chromate solution, it turns orange (dichromate) because the equilibrium shifts to the right, inorder to reduce the excess hydrogen ions from the HCl Acid.

    But when I add HCl to dichromate, the color changes the same. How do i explain this phenomenon.

    and is this the right equation?

    2[CrO4]-2 + [H]+ <---> [Cr2O7]-2 + H2O
  2. jcsd
  3. May 7, 2009 #2


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    Staff: Mentor

    Equation is OK.

    Take a look at it - what would you expect if you dissolve dichromate in pure water?
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