What is the best experimental procedure to determine the solubility of copper sulphate at different temperatures?

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Nikolay A. Mironov

I think AAS will be the best. Select aliquotes, dilute to working concentration interval and analyze the Cu.

Carlos Araújo Queiroz

It is important to note that there are different hydrates of copper sulfate, which can crystallize (or not) from their saturated aq. sol. at different temperature and composition ranges, so that the equilibrium solubility of distinct hydrates should be considered. The thermodynamics of the equilibrium CuSO4―H2O sol. system is somewhat complex, as it includes several hydrates, and depends on temperature, composition, and pressure.

You may find useful to check: Alexander Findlay, “The Phase Rule and its Applications”, 9th ed. (by A.N. Campbell, N.O. Smith), Dover Publications Inc., 1951, pp. 220-224.