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When conducting an experiment to determine what effect the temperature of water has on the solubility of sugar, what variable(s) should remain constant?

I. The amount of water used.
II. The temperature of the water.
III. The type of sugar used.
IV. The surface area of the sugar.
V. The agitation applied to the solution.

A. I, III, IV, and V
B. All of these
C. I and III only
D. II only

solubility is the ability of a substance, the solute, to form a solution with another substance, the solvent. Insolubility is the opposite property, the inability of the solute to form such a solution.

The extent of the solubility of a substance in a specific solvent is generally measured as the concentration of the solute in a saturated solution, one in which no more solute can be dissolved.

At this point, the two substances are said to be at the solubility equilibrium. For some solutes and solvents, there may be no such limit, in which case the two substances are said to be "miscible in all proportions"

For many solids dissolved in liquid water, the solubility increases with temperature.

The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions.

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