NY Regents Chemistry Exam June 2022

41 Based on Table *G*, which solute sample in 100.g of water at 40.°C can produce a solution equilibrium in a closed system?
(1) 10. g KClO3

(2) 25 g NaCl

(3) 45 g KCl

(4) 55 g KNO3

Explanation: Table G on the Reference Table is a solubility curve table. If we end up on the curve, this represents the maximum amount of solute dissolved in 100 g of water and equilibrium for the solution. First, we need to find 40.°C on the x-axis. Next, we need to find the curve for all the solutes in the answer choices. 10. g KClO3 is below the KClO3 curve. 25 g NaCl of NaCl at 40.°C is below the NaCl curve line. 45 g KCl at 40.°C is above the KCl curve. 55 g KNO3 at 40.°C is below the KNO3 curve.

Answer: 3