A laboratory stock solution is 1.50 M NaOH. Calculate the volume of this stock solution that would be needed to prepare 300. mL of 0.200 M NaOH. a. 2.25 mL b. 10.0 mL c. 40.0 mL d. 1.0 mL e. 0.100 mL

Option c. 40 mL

Explanation:

Dilution formula:

M Concentrated . Concentrated Volume = Diluted volume . M diluted

1.50 M . Concentrated volume = 300 mL . 0.200 M

Concentrated volume = (300 mL . 0.200 M) / 1.50 M

Concentrated volume = 40 mL

When the dilution factor is applied, it is indicated how many times a concentration is diluted to obtain a lower solute concentration, so its concentration depends on the number of solute particles and the total volume