Dichromic Acid
Dichromic acid, H2Cr2O7, (structure illustrated top right) is the fully protonated form of the dichromate ion and also can be seen as the product of adding chromium trioxide to molecular chromic acid.
- 2− + 2H+ H2Cr2O7 H2CrO4 + CrO3
It is probably present in chromic acid cleaning mixtures along with the mixed chromic-sulfuric acid H2CrSO7.
Read more about this topic: Chromic Acid