13.23 The solubility of Cr(NO3)3 . 9 H2O in water is 208g per 100 of water at 15 °C. A solution of Cr(NO3)3 * 9 H20 in water at 35°C is formed by dissolving 324 g in 100 g of water. When this solution is slowly cooled to 15 °C, no precipitate forms (a) Is the solution that has cooled down to 15 °C unsaturated saturated, or supersaturated? (b) You take a metal spatula and scratch the side of the glass vessel that contains this cooled solution, and crystals start to appear. What has just happened? (c) At equilibrium, what mass of crystals do you expect to form?

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter13: The Chemistry Of Solutes And Solutions
Section: Chapter Questions
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13.23 The solubility of Cr(NO3)3 . 9 H2O in water is 208g per 100
of water at 15 °C. A solution of Cr(NO3)3 * 9 H20 in water at
35°C is formed by dissolving 324 g in 100 g of water. When
this solution is slowly cooled to 15 °C, no precipitate forms
(a) Is the solution that has cooled down to 15 °C unsaturated
saturated, or supersaturated? (b) You take a metal spatula
and scratch the side of the glass vessel that contains this
cooled solution, and crystals start to appear. What has just
happened? (c) At equilibrium, what mass of crystals do you
expect to form?
Transcribed Image Text:13.23 The solubility of Cr(NO3)3 . 9 H2O in water is 208g per 100 of water at 15 °C. A solution of Cr(NO3)3 * 9 H20 in water at 35°C is formed by dissolving 324 g in 100 g of water. When this solution is slowly cooled to 15 °C, no precipitate forms (a) Is the solution that has cooled down to 15 °C unsaturated saturated, or supersaturated? (b) You take a metal spatula and scratch the side of the glass vessel that contains this cooled solution, and crystals start to appear. What has just happened? (c) At equilibrium, what mass of crystals do you expect to form?
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