A chemist mixes 125 milliliters of a solution that is 18% acid with 500 milliliters of pure acid. (a) How many milliliters of acid are in the resulting mixture? (b) What percentage of the resulting mixture is acid?
A .18 (125) + 500 = ........ ml
B Total result is 125 + 500 = 625 ml
Divide answer A by this to get fraction that is acid, multiply by 100 to get %