Question

what happens when a saturated salt solution is heated after adding a small quantity of salt to it?

Answer 1

when the saturated salt solution is heated then it becomes unsaturated because saturation decreases with the increase in temperature

Answer 2

A saturated solution is that solution which can't allow more solute to be dissolved in it.

Since, if this saturated solution is heated and some salt is mixed into it we will find that salt will dissolve in it. Making it a supersaturated solution.