A chemist makes 760. mL of calcium bromide (CaBr) working solution by adding distilled water to 290. mL of a 3.18 M stock solution of calcium bromide in water.

Concentration of the working solution is 1.213 M

Explanation:

Using dilution equation we can calculate the concentration of the working solution

Initial concentration * Initial volume = Final concentration * final volume

In this case;

Volume of working sol = 760 mL

Initial concentration = 3.18 M

Initial volume = 290 mL

Concentration of working sol=?

Therefore;

3.18 M * 290 mL = 760 mL * y

Concentration of working solution = (3.18 * 290) / 760

= 1.213 M

Therefore: the concentration of the working solution is 1.213 M