Achemist 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

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