Answer :
A single crystal of solute was added to a solution, and many additional crystals settled to the bottom (crystals came out of solution). the original solution was supersaturated solution.
A supersaturated solution contains more dissolve solute than the saturated solution. supersaturated solution is unstable and will readily crystallizes when added a seed crystal or when the solution is disturbed. A solution that contain maximum amount of the dissolved solute than saturated solution .
Thus, A single crystal of solute was added to a solution, and many additional crystals settled to the bottom (crystals came out of solution). the original solution was supersaturated solution.
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