Problema Solution
Pure acid is to be added to a 10% acid solution to obtain 90L of 50% solution. What amounts of each should be used?
Answer provided by our tutors
let 'x' represent the amount of 10% acid solution, then '90-x' represents the amount of pure acid solution
the ratios are expressed in this equation:
0.50*90 = 0.10x + (90-x)
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x=50
90-50 = 40
So 40L of pure acid solution should be added to 50L of 10% acid solution in order to produce 90L of 50% acid solution.