The solubility of a substancce is 60 g per 100 mL of water at15°C. A solution of

Question

The solubility of a substancce is 60 g per 100 mL of water at15°C. A solution of this substance is prepared by dissolving 75g in 100 mL of water at 75°C. The solution is then cooledslowly to 15°C without any solid separating. The solutionis A. supersaturated at 75°C B. supersaturated at 15°C C. unsaturated at 15°C D. saturated at 15°C Please EXPLAIN youranswer. The solubility of a substancce is 60 g per 100 mL of water at15°C. A solution of this substance is prepared by dissolving 75g in 100 mL of water at 75°C. The solution is then cooledslowly to 15°C without any solid separating. The solutionis A. supersaturated at 75°C B. supersaturated at 15°C C. unsaturated at 15°C D. saturated at 15°C Please EXPLAIN youranswer.

Explanation / Answer

                 The solubility of a substance is the number of grams of asolute in 1 L of the solution . The solubility changes withtemperature . At 15oC the solubility is 60 gper 100 mL of water.           The solution at 75oC is cooled to 15oCat which the solubility exeeds the maximum value . So it is a supersaturated solution.

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