Question

A solution is made by dissolving KBr in water. If 22.1 grams of KBr are dissolved and the solution has a percent by mass concentration of 2.65% what mass of water was used to make the solution?

Answer 1

To find the mass of water used to make a solution with a certain percent by mass concentration, set up a proportion using the given percent and the known mass of solute. Solve for the mass of water using cross-multiplication.

Step-by-step explanation:

To find the mass of water used to make the solution, we need to first calculate the mass of KBr in the solution. We are given that the percent by mass concentration of the solution is 2.65%. This means that 2.65 grams of KBr is present in 100 grams of the solution.

Let's set up a proportion to find the mass of KBr in the solution. We know that 22.1 grams of KBr is dissolved in x grams of water:

(2.65 grams KBr) / (100 grams solution) = (22.1 grams KBr) / (x grams water)

Solving for x, we find that the mass of water used to make the solution is approximately 837 grams.