Question 1 (2 points) A solubility graph shows the solubility of three substances (A. B, and C) in 100 mL of water at different temperatures. Substance As solubility Increases significantly with temperature while B and C show little change. At60^circ C - A dissolves up to 1009 - 8 dissolves up to 409 - Cdissolves up to 20g If 70 gof Substance A is dissolved in water at 60^circ C and then cooled to 30^circ C, where its solubility is 50 C. which of the following COULD happen to the solution? Column A 1. __ The solution is supersaturated after cooling 2 __ The solution is saturated with 20g of solute undissolved after cooling. 3. __ The solution is unsaturated after cooling 4. __ A crystal is added to the heated solution and rapid crystallization occurs 5. __ A crystal is added to the cooled solution and rapid crystallization occurs. 6. __ The heated solution is saturated 7. __ The heated solution is unsaturated Column B a. Possible b. Not possible

To determine what could happen to the solution when it is cooled from 60°C to 30°C, we need to consider the solubility of Substance A at each temperature.<br /><br />At 60°C, the solubility of Substance A is 100g. This means that at this temperature, 100g of Substance A can dissolve in 100mL of water.<br /><br />At 30°C, the solubility of Substance A is 50g. This means that at this temperature, only 50g of Substance A can dissolve in 100mL of water.<br /><br />Now let's analyze each statement in Column A:<br /><br />1. The solution is supersaturated after cooling.<br /> - This is possible. When the solution is cooled from 60°C to 30°C solubility of Substance A decreases. If the solution initially contained 70g of Substance A, it would be supersaturated at 30°C because only 50g can dissolve at this temperature.<br /><br />2. The solution is saturated with 20g of solute undissolved after cooling.<br /> - This is not possible. If the solution initially contained 70g of Substance A, it would be supersaturated at 30°C. The excess solute would crystallize out, but it would not be saturated with 20g of solute undissolved.<br /><br />3. The solution is unsaturated after cooling.<br /> - This is not possible. The solution would be supersaturated at 30°C, so it cannot be unsaturated.<br /><br />4. A crystal is added to the heated solution and rapid crystallization occurs.<br /> - This is possible. If a crystal of Substance A is added to the supersaturated solution at 30°C, rapid crystallization would occur as the excess solute precipitates out.<br /><br />5. A crystal is added to the cooled solution and rapid crystallization occurs.<br /> - This is possible. If a crystal of Substance A is added to the supersaturated solution at 30°C, rapid crystallization would occur as the excess solute precipitates out.<br /><br />6. The heated solution is saturated.<br /> - This is possible. At 60°C, the solubility of Substance A is 100g, so the heated solution would be saturated if it contains 70g of Substance A.<br /><br />7. The heated solution is unsaturated.<br /> - This is not possible. The heated solution would be saturated if it contains 70g of Substance A at 60°C.<br /><br />Therefore, the correct answers are:<br />1. a. Possible<br />2. b. Not possible<br />3. b. Not possible<br />4. a. Possible<br />5. a. Possible<br />6. a. Possible<br />7. b. Not possible