You need a 25% alcohol solution. On hand, you have a 75 mL of a 90% alcohol mixture. How much pure water will you need to add to obtain the desired solution? You will need __ mL of pure water to obtain __mL of the desired 25% solution.
1 Answer
Mar 12, 2018
Added water
Explanation:
Let the amount of the final blend be
Note that the alcohol content of the water is 0
The amount of alcohol in the 90% mix is
The final blend is to be a 25% solution
Turn everything upside down
Added water
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