SOLUTION: How much distilled water must be mixed with alcohol 70% to prepare 5 L of alcohol 40%?
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Question 714223: How much distilled water must be mixed with alcohol 70% to prepare 5 L of alcohol 40%?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = liters of distilled water to be used
Let = liters of 70% alcohol to be used
= liters of alcohol in 70% solution
------------
I end up with 5 liters, so
(1)
and also,
(2)
----------------
(2)
(2)
and, since
(1)
(1)
(1)
2.1429 liters of water must be used
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