SOLUTION: You need a 80% alcohol solution. On hand, you have a 60 mL of a 5% alcohol mixture. How much pure alcohol will you need to add to obtain the desired solution?

Question 1099061: You need a 80% alcohol solution. On hand, you have a 60 mL of a 5% alcohol mixture. How much pure alcohol will you need to add to obtain the desired solution?
Found 2 solutions by josgarithmetic, josmiceli:
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
x, how much of 100% alcohol
(assuming percent is mass per volume)

----solve for x.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = mL of pure alcohol needed
mL of alcohol in the 5% mixture
--------------------------------------------

225 mL of pure alcohol should be added
----------------------------------------
check answer:

OK
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