Question

You have 500 mL of a 4.00 M solution of KNO3 from a previous experiment, but now you need 250 mL of a 0.500 M concentration of the same solution. How much of the stock solution will you need to make the dilute solution?

A. 9.09 mL

B. 23.08 mL

C. 31 mL

Thanks.

Answer 1

You will need to make the dilute solution, 31 mL of the stock solution.

(option c.)

Step-by-step explanation:

To solve this, you have to apply the dilution factor which relates:

volume in diluted solution / volume in concentrated solution Concentrated Molarity / Diluted Molarity

250 mL / volume in conc. solution = 4 M / 0.5M

250 mL = (4 M / 0.5M) . volume in conc. solution

250 mL = 8 . volume in conc. solution

250 mL / 8 = volume in conc. solution → 31.25 mL