When anhydrous sodium sulfate dissolves in water, the solution becomes warmer than the temperature of the water before solution. How will the solubility of anhydrous sodium sulfate vary with temperature?
Once the solution temperature increases, the dissolution process is exothermic (releases heat to the environment). According to Le Chatelier's principle, decreasing the temperature will accelerate the forward reaction. Therefore, anhydrous sodium sulfate is more soluble at low temperature.
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