A chemist wants to make 3 liters of a 7% acid solution by mixing a 9% acid solution and a 4 percent acid solution. How many liters of each solution should the chemist use?

1 Answer
Shwetank Mauria
May 30, 2017

#1.8# liters of #9%# solution and #1.2# liters of #4%# solution

Explanation:

In mixture problems combining two solutions write their strengths, draw a cross through a desired concentrate in the centre and find out the differences. In the above case it is as shown below.
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The ratio of differences is #3:2# and hence two concentrates should be mixed in this ratio.

Hence we should have #3xx3/5=9/5=1.8# liters of #9%# solution

and #2xx3/5=6/5=1.2# liters of #4%# solution

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