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Chromate and dichromate
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<p>Chromate salts contain the chromate anion, CrO2−4. Dichromate salts contain the dichromate anion, Cr2O2−7. They are <a href="/facts/Oxyanion/0GuWXr6D">oxyanions</a> of <a href="/facts/Chromium/6sVk6Uu7">chromium</a> in the +6 <a href="/facts/Oxidation_state/W53W6s6V">oxidation state</a> and are moderately strong <a href="/facts/Oxidizing_agent/1FQzB8pQ">oxidizing agents</a>. In an <a href="/facts/Aqueous/eRNr3MH2">aqueous</a> <a href="/facts/Solution_(chemistry)/MGchhMQV">solution</a>, chromate and dichromate ions can be interconvertible. </p>