Most dichromates, except of alkali metals, are insoluble in water
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Dichromate can be either soluble or insoluble, depending on the compound it is combined with. For example, sodium dichromate is soluble in water, while lead(II) dichromate is insoluble.
The dichromate ion has the charge -2.
In an acidic solution chromate ions are converted into dichromate ions.
Dichromate is Cr2O7^2- so it has 7 oxygen atoms in one molecule
k2cr2o7K2Cr2O7
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