Cobalt(II) carbonate

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.

## Properties[edit]

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.

## Preparation[edit]

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