What is the freezing point of an aqueous 1.58 molal NaCl solution? (K_f = 1.86°C/m) A)-2.94°C B)2.94°C C)-5.88°C D)5.88°C E)0.00°C

Question

Quizplus · Accepted Answer

The freezing point depression depends on the molality of the solution and the molal freezing point depression constant (K_f) which is given as 1.86°C/m. △Tf = K_f x molality Substituting the given values, we get: △Tf = 1.58 mol/kg x 1.86°C/m △Tf = 2.94°C Since the freezing point is lowered by this amount, the freezing point of the solution would be the normal freezing point minus the △Tf, which is: Freezing point of water = 0°C Freezing point of the solution = 0°C - 2.94°C = -5.88°C Therefore, the freezing point of the aqueous 1.58 molal NaCl solution is -5.88°C. The correct answer is option C.

What Is the Freezing Point of an Aqueous 1