A 2% solution of sulfuric acid was mixed with a 12% solution of sulfuric acid to produce an 8% solution. How do you determine how much 2% solution and how much 12% solution were used to produce 10 gallons of 8% solution?

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Answer 1 · 2016-04-28T16:49:07

The amount of higher concentration used is #60%#
The amount of lower concentration used is #40%#

There is a trick to this that I discovered when my job was blending of different concentrations.
Tony B

Let the % amount of higher concentration be #x#

Then by ratio

#(12-2)/100=(8-2)/x#

#=>x/6=100/10#

#=>x=6xx10=60%#
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Check:

#(60/100xx12)+(40/100xx2) =8" "#as required