Question

You need a 30% alcohol solution. On hand, you have a 50 mL of a 20% alcohol mixture. You also have 35% alcohol mixture. How much of the 35% mixture will you need to add to obtain the desired solution?You need a 30% alcohol solution.

Answer 1

100 mL

Explanation:

If x is the volume of 35% solution, then:

0.35x + 0.20(50) = 0.30(x + 50)

0.35x + 10 = 0.30x + 15

0.05x = 5

x = 100

You need 100 mL of 35% solution.