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<p> as both the base and a <a href="page.php?w=coordination_compound">complexing agent</a>. It can also be prepared by electrolysis of a solution of cobalt nitrate with a <a href="page.php?w=platinum">platinum</a> cathode.</p>

<p><big>Reactions</big></p>
<p>Cobalt(II) hydroxide decomposes to <a href="page.php?w=cobalt%28II%29_oxide">cobalt(II) oxide</a> at 168&nbsp;°C under <a href="page.php?w=vacuum">vacuum</a> and is oxidized by air. The thermal decomposition product in air above 300&nbsp;°C is <a href="page.php?w=Cobalt%28II%2CIII%29_oxide">Co<sub>3</sub>O<sub>4</sub></a>.</p><p>
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