Cobalt(II) carbonate

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Cobalt(II) carbonate on coffee filter

Cobalt(II) carbonate, also known as cobaltous carbonate, is a chemical compound. Its chemical formula is CoCO3. It contains cobalt and carbonate ions. The cobalt is in its +2 oxidation state.


Cobalt(II) carbonate is an indigo solid. It reacts with acids, like all carbonates, to make a cobalt(II) salt and carbon dioxide gas. With hydrochloric acid it makes cobalt(II) chloride. It decomposes when heated strongly to cobalt(II) oxide.


It is made by reacting sodium carbonate with cobalt(II) chloride.