Question

James Proton prepares a saturated solution of sodium chloride in a beaker by adding solid sodium chloride and stirring. When James finishes, crystals of sodium chloride are observed at the bottom of the beaker. Which statement is true regarding the solution?

A. The concentration of sodium ions is constantly changing.
B. The concentration of chloride ions is constantly changing.
C. Solid sodium chloride never dissolves to form sodium ions and chloride ions.
D. Sodium ions and chloride ions collide and combine to form solid sodium chloride.

Answer 1

Your answer is choice C. That is solid sodium chloride never dissolves to form sodium ions and chloride ions.

Going further to explain, have a look at the question again, we are told that James Proton prepares a saturated solution of sodium chloride in a beaker by adding solid sodium chloride and stirring.

Then when James finishes, crystals of sodium chloride are observed at the bottom of the beaker.

This implies that no more salt was dissolving since the saturation point was reached.

Again suppose he increased the temperature of the reaction, more salts could have dissolved.