What do you predict will happen when a crystal of potassium nitrate is added to the saturated solution as it is cooled What might happen if no crystal were present?

When a crystal of potassium nitrate is added to the saturated solution as it is cooled, it will act as a seed crystal for the excess solute to come out of solution and crystallize. If no crystal were present, the solution may remain supersaturated, meaning it contains more solute than it can naturally hold, leading to potential spontaneous crystallization or precipitation with any disturbance.