A science teacher has a supply of 5% hydrochloric acid and a supply of 65% hydrochloric acid (HCl). How much of each solution should the teacher mix together to get 42 mL of 45% HCl for an experiment?

Question

a. The teacher will need 14 mL of the 5% solution and 28 mL of the 65% solution.

b. The teacher will need 28 mL of the 5% solution and 14 mL of the 65% solution.

c. The teacher will need 14 mL of the 5% solution and 14 mL of the 65% solution.

d. The teacher will need 28 mL of the 5% solution and 28 mL of the 65% solution.

Answer 1

A. I googled it

Answer 2

5x + 65(42-x) = 45*42

Answer 3

thnx