You need a 20% alcohol solution. on hand, you have a 240 ml of a 15% alcohol mixture. you also have 40% alcohol mixture. how much of the 40% mixture will you need to add to obtain the desired solution?

Question

Chemistry

Danika Church

31 December, 21:19

You need a 20% alcohol solution. on hand, you have a 240 ml of a 15% alcohol mixture. you also have 40% alcohol mixture. how much of the 40% mixture will you need to add to obtain the desired solution?

+2

Answers (1)

Know the Answer?

Mister · Answer 1

0.15*240=36 ml of alcohol in 240 ml of a 15% alcohol mixture

0.4x = ml of alcohol in x ml of a 40% alcohol mixture

0.2 (x+240) = ml of alcohol in (x+240) ml of a 20% alcohol mixture

0.15*240 + 0.4x = 0.2 (x+240)

36+0.4x=0.2x+48

0.2x = 12

x=12/0.2=120/6=20 ml of a 40% alcohol mixture