Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 12 - Sections 12.1-12.8 - Exercises - Problems by Topic - Page 589: 43

Answer

During the cooling, $KNO_3$ will precipitate.

Work Step by Step

At $40 ^{\circ}C$, the solubility of $KNO_3$ in water is greater than 45 g $KNO_3$ / 100 g $H_2O$. Thus, the solution is unsaturated at that temperature. But, at $0^oC$, the solubility is lower than that. Therefore, during that process, the solution will reach the maximum solubility of that compound, which will cause its precipitation.
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