When a 1.0 M solution of NaCl at 25°C is heated to 55°C,the
A)density decreases and the molarity decreases.
B)density decreases and the molarity increases.
C)density increases and the molarity decreases.
D)density increases and the molarity increases.

Question

Quizplus · Accepted Answer

As temperature increases, the volume of the solution expands due to increased kinetic energy of the particles. This results in a decrease in density. However, since the amount of NaCl dissolved in the solution remains constant, the molarity (moles of solute per liter of solution) will also remain constant. Therefore, option A is correct - the density decreases and the molarity remains the same.

When a 10 M Solution of NaCl at 25°C Is Heated to Heated