Will Sodium sulfate during dissolution heat or cool pure water?

Question

Solubility of Sodium Sulfate decreases sharply on cooling from 50 deg C to 0 deg C and crystals are obtaind during cooling. Will the crystals heat or cool pure water during redissolution, if the pure water is at room temperature.(say, 30 deg. C)?(Assume adiabatic conditions, i.e no heat is given to or taken from the system)

Answer 1

Since the solubility of the stuff increases with increasing temperature, that would suggest that dissolving sodium sulfate is endothermic. If that's true, then dissolving it in pure water would cause the water to cool down.