Supersaturated solutions are prepared by dissolving those solutes whose solubilities

Options

A. decrease at lower temperatures
B. increase at higher temperatures
C. do not change with temperatures
D. increase at lower temperatures

Answer

2

Explanation

the solubilites of many solid solutes increase at higher temperatures. Super-sturated solutions contains higher-than saturated concentrations of solute. They can sometimes be prepared by saturating a solution at a high temperature.
The resulting saturated solution is cooled slowled, without agitation, to temperature at which the solute is less soluble. At this point, the resulting supersaturated solution is meta stable (temporarity stable). This may be throught of as a state of pseudo equilibrium in which the system is at a higher energy than in its most stable state. In such a case, the solute has not yet become sufficiently organized for crystallization to begin.
A supersaturated solution produces crystal rapidly if it is slightly disturbed or if it is "seeded" with a dust particle or a tiny crystal. Under such conditions enough solid crystallizes to leave a saturated solution.