A 30.0 g sample of potassium nitrate is dissolved in 100 g of water at 60 °C.The solution is cooled to 20.0 °C and a small amount of precipitate is observed.This solution is ________.
A)hydrated
B)placated
C)saturated
D)unsaturated
E)supersaturated

Question

Quizplus · Accepted Answer

At 60 °C, the solubility of potassium nitrate in water is higher than at 20 °C. Therefore, when the solution is cooled, the solubility of potassium nitrate decreases and some of the excess potassium nitrate comes out of solution and forms a precipitate. At this point, the solution is saturated, meaning that it contains the maximum amount of dissolved solute at that temperature.

A 300 G Sample of Potassium Nitrate Is Dissolved in 100