70 grams of potassium nitrate completely dissolve in a solution at 55°C. The same amount of solute remains dissolved when the temperature of the solution drops to 45°C, until a ____ crystal is added. At this point the excess solute rapidly falls out of the solution.
We form a supersaturated solution. At 45 °C the solution has more potassium nitrate that can be dissolved. The recrystallization of the excess dissolved solute can be started inserting a crystal that is called seed crystal.
