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Reference.org
Copper(II) nitrate
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<p>Copper(II) nitrate describes any member of the family of <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compounds</a> with the formula <a href="/facts/Copper/I8PEE8oX">Cu</a>(<a href="/facts/Nitrate/5AnVlYnL">NO3</a>)2(H2O)x. The hydrates are <a href="/facts/Hygroscopic/1NBGewXv">hygroscopic</a> blue <a href="/facts/Solid/hj5UsXno">solids</a>. <a href="/facts/Anhydrous/A7B0fDLE">Anhydrous</a> copper nitrate forms blue-green crystals and <a href="/facts/Sublimation_(phase_transition)/KDoKokMn">sublimes</a> in a vacuum at 150-200 °C. Common hydrates are the hemipentahydrate and trihydrate. </p>