Question

18. How would you prepare 250.mL of a 4.50 v/v % alcohol in water solution? a) add 4.50 mL of alcohol to 250 mL of water b) add 11.25 mL of alcohol to 250 mL of water c) add 11.25 mL of alcohol to a container; then add water to the 250-ml mark d) add 4.50 mL of alcohol to a container; then add 245.5 mL of water e) add 11.25 mL of alcohol to a container; then add 238.75 mL of water

Answer 1

We know that volume of alcohol %v/v= x 100 volume of the solution volume of alcohol 4.50 x 100 250 mL 4.50x 250 mL volume of alcohol = L00 volume of alcohol = 11.25 mL Volume of alcohol required 11.25 mL To a 250. mL volumetric flask, add 11.25 mL ofalcohol and then add water up to the mark. Option B is the right answer.