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Conjugate acid‎: ‎Chromic acid (H 2CrO 4).Molecular Weight/ Molar Mass: 194.1896 g/mol.It occurs at low pH values,i.e., lower than 6.5. It is commonly found at high pH values, i.e., above 6.5. The dichromate anion chemical formula is Cr 2O 7 2. This is anion’s chemical formula is CrO 4 2. The following table enumerates the key differences between chromate and dichromate: Characteristics Usually, you can find a high amount of chromate at high pH values, i.e., in an alkaline medium, while at low pH values or an acidic medium, you are likely to find more dichromate ions.

While it appears bright yellow, dichromate has a bright orange colour. There is a marked difference in their colour. However, the two are quite different from each other. Therefore, both are oxoanions of chromium. Lewis structure of Chromate What is the Difference between Chromate and Dichromate?Ĭhromate and dichromate are two different anions containing the same elements– chromium and oxygen. The following image depicts the Lewis structure of a chromate ion. Two oxygen atoms carry a -1 charge on them. There are four oxygen atoms and a chromium atom. The anion has two single covalent bonds and two double covalent bonds. The Lewis structure of the chromate ion shows its bonding and non-bonding electrons. The anion has a minus two negative charge. This structure has one chromium atom and four oxygen atoms. Chromate chemical formula/ chromate symbol: CrO 4 2.