Answer to Question #178126 in General Chemistry for Hammad

Question #178126

A student prepares a supersaturated solution by dissolving 60.0 g of ammonium chloride, NH4Cl(s), in 100 g of water at 70 °C. She then gradually cools the solution to 50 °C. Finally, she adds a small seed crystal to the solution. Predict how much ammonium chloride crystallizes out of solution, leaving a saturated solution, explain your answer in words.


1
Expert's answer
2021-04-09T01:46:36-0400

3g

When the ammonium chloride solution crystallizes, the oppositely charged ions are brought closer together by the crystal structure. Since formation of a crystal lattice lowers potential energy by placing like charges close together, the system releases the excess energy in the crystallization process. Thus a few grams crystallize



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