A student prepares solutions of saturated NaNO₃, NaCl, and Ce₂(SO₄)₃ • 9H₂O. The student confirms the solutions are saturated by adding more solute and noticing a precipitate at the bottom of each solution. The contents of each solution are heated gently, and the precipitate in the NaNO₃ solution dissolves completely. The student notices no visual change in the quantity of NaCl dissolved and notices that more precipitate forms when the Ce₂(SO₄)₃ • 9H₂O solution is heated.
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Figure 1. Solubility vs. temperature graph of various compounds.
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Table 1. Solubility of various compounds at 30 °C.

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