An alcohol-water solution is by volume 40.0% isopropyl alcohol. There is 500.mL of the solution. How many mL of alcohol were added to water when preparing the solution?

1 Answer
Miriam G.
Apr 4, 2018

#200# mL

Explanation:

With a total solution of #500# mL, you can say that is #100%# of your solution. You also know that there are #x# mL of isopropyl alcohol making up #40%# of your total soultion. With this information you can set up a proportion.

#500/100=x/40#

#5=x/40#

#200=x#

This means you added #200# mL to the water.

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