Problema Solution
how much pure acid should be mixed with 5 gallons of a 70% acid solution in order to get a 90% acid solution?
Answer provided by our tutors
Let x represent the amount of pure acid added (note: that is an 100% solution)
.70*5gal + 1.00*x = .90(5gal + x)
solve for x
.10x = .10*5gal
x = 5 gal of pure acid needs to be added.