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A supersaturated solution of sucrose (C12H22O11) is made by dissolving sucrose in hot water and slowly letting the solution cool to room temperature. After a long time, the excess sucrose crystallizes out of the solution. Indicate whether each of the following statements is true or false:

A. After the excess sucrose has crystallized out, the remaining solution is not saturated.
B. After the excess sucrose has crystallized out, the system is now stable and is in equilibrium.
C. After the excess sucrose has crystallized out, the rate of sucrose molecules leaving the surface of the crystals to be hydrated by water is greater than the rate of sucrose molecules in water attaching to the surface of the crystals.

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Answer:

A. False

B. True

C. False

Explanation:

  • A. After the excess sucrose has crystallized out, the remaining solution is not saturated.

This is false, once the excess sucrose has crystallized out, the remaining solution is saturated. There's as much sucrose as can be in that amount of water at that temperature.

  • B. After the excess sucrose has crystallized out, the system is now stable and is in equilibrium.

This is true, it is stable because it will not change by itself, it is in equilibrium because the rate of sucrose molecules leaving the surface of the crystals to be hydrated by water is equal to the rate of sucrose molecules in water attaching to the surface of the crystals.

  • C. Is false because the system is in equilibrium, so the two rates are equal.

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