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Solutions and Solubility

Question 7 • HCISD-Integrated Physics and Chemistry A-CR SUMMER

Sugar cubes are added to a solution of water and lemon juice to make lemonade. The solubility of sugar is 200 g/100 g H2O at the temperature of the solution. What can be done to increase the rate of dissolution without affecting the solubility? Check all of the boxes that apply.

Answer
A
warming the solution
B
adding ice cubes to the solution
C
stirring the solution
D
crushing the sugar cubes
E
increasing the pressure on the solution

Explanation

Stirring brings fresh liquid into contact with the sugar, and crushing the cubes exposes more sugar surface area; both speed up dissolution without changing the solubility. Warming or adding ice changes the solution’s temperature, which can affect sugar’s solubility. Increasing pressure has little effect on the solubility of a solid in a liquid and does not meaningfully speed its dissolution.

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