How many milliliters of a 2.0 molar sodium chloride solution would be needed to prepare 250 mL of 0.15 molar sodium chloride solution?

18.75 mL

Explanation:

We must apply the dilute factor formula to solve this:

Diluted volume. Diluted M = Concentrated volume. concentrated M

250 mL. 0.15 M = Concentrated volume. 2 M

(250 mL. 0.15 M) / 2M = Concentrated volume

18.75 mL = Concentrated volume