Chromium VI forms two different oxyanions the orange dichromate ion Cr2O7 2
Chromium(VI) forms two different oxyanions, the orange dichromate ion (Cr2O7-2), and the yellow chromate ion (CrO4-2). (See the photos below.) The equilibrium reaction between the two ions is
Cr2O7-2(aq) + H2O(l) ⇌ 2CrO4-2(aq) + 2H+(aq)
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