A solution is made by dissolving 85.0 mL of sodium fluoride to water until the final volume is 350.0 mL. Identify the solute in this solution.

A. Sodium flouride

B. Water

C. Sodium fluoride and water

D. Unable to determine

Sodium fluoride

Explanation:

A solution is constituted by two parts: the solute and the solvent (there may be more than 1 solute and more than 1 solvent, but that is not the key of the answer).

Solute is the substace that is dissolved and it is in less amount than the solvent.

Solvent is the substance that can dissolve the solute and it is a greater amount than the solute.

In the given solution:

sodium fluoride, 85.0 mL, is the solute, water, 350.0 mL is the solvent, and the mixture of both substances is the solution.