At 90 °C, a solution of 80 g of KNO3 in 100 g of H2O. At what temperature does the same KNO3 solution becomes saturated?

Question

At 90 °C, a solution of 80 g of KNO3 in 100 g of H2O. At what temperature does the same KNO3 solution becomes saturated?

Greater than 150 °C
Greater than 50 °C
At 50 °C
Less than 50 °C

Answer 1

Less than 50 °C

When the solution is at 90 °C and becomes saturated, the solubility of KNO3 in water will decrease as the temperature decreases. Therefore, the temperature at which the same KNO3 solution becomes saturated will be below 50 °C.