Question

what happens when we put a crystal in an unsaturated solution

Answer 1

When you add a crystal of a solute to an unsaturated solution, the crystal dissolves, becoming part of the solution. An unsaturated solution has the capacity to dissolve more solute, so any solute added, up to the solution’s saturation point, dissolves. Once the solution is saturated, any solute crystals added sink into the solution but don’t dissolve.

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Answer 2

When we put some salt as a solute in a solution which is unsaturated then the salt will dissolve completely  in it but as the unsaturated solution become saturated it  will not dissolve in it. Then you will get the precipitate of that salt..