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Yttrium sulphate, Y_{2}(SO_{4})_{3}
The specific heat of the anhydrous Yttrium sulphate, Y_{2}(SO_{4})_{3}, between 0° and 100° is 0.1319.
The following double sulphates are known (Cleve):  Y_{2}(SO_{4})_{3}.Na_{2}SO_{4}.2H_{2}O; Y_{2}(SO_{4})_{3}.(NH_{4})_{2}SO_{4}.9H_{2}O; 2Y_{2}(SO_{4})_{3}.3K_{2}SO_{4}; Y_{2}(SO_{4})_{3}.4K_{2}SO_{4}. The addition of sodium sulphate increases the solubility of yttrium sulphate at first, and then causes the solubility to diminish rapidly. With diminution in solubility is associated a change in solid phase, from hydrated yttrium sulphate to double salt. Solutions supersaturated with respect to the double salt may remain in the metastable state for several months. The solubility curve for a temperature of 25° is shown in fig. 
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