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Cerium(III) sulfate
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<p>Cerium(III) sulfate, also called cerous sulfate, is an <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the formula Ce2(SO4)3. It is one of the few salts whose <a href="/facts/Solubility_table/lR3eqh96">solubility</a> in water decreases with rising temperature. </p><p>Cerium(III) sulfate (<a href="/facts/Anhydrous/A7B0fDLE">anhydrous</a>) is a <a href="/facts/Hygroscopy/1NBGewXv">hygroscopic</a> white solid, which begins to decompose above 600°C. It has a <a href="/facts/Monoclinic_crystal_system/5PCwXvzX">monoclinic</a> <a href="/facts/Crystal_structure/bJ4bCeHd">crystal structure</a>. </p><p>Cerium(III) sulfate tetrahydrate is a white solid that releases its <a href="/facts/Water_of_crystallization/sbaKJNJX">water of crystallisation</a> at 220 °C. It has (like the white octahydrate) a monoclinic crystal structure with the space group <i>P</i>21/<i>c</i> (<a href="/facts/Space_group/2XQx0J7M">space group</a> 14). The nonahydrate has a hexagonal crystal structure with the space group <i>P</i>63/<i>m</i> (space group 176). Hydrates of this compound are known with 12, 9, 8, 5, 4 and 2 parts of water of crystallisation. </p>