Question

Hydrochloric acid solution and

70% hydrochloric acid solution
must be mixed to obtain 20
ounces of 50% hydrochloric acid
solution?

Answer 1

Answer:

8 ounces of 20%12 ounces of 70%

Explanation:

Let 'x' be the number of ounces of 20% solution'y' be for the 70%

solutionSince the the mix is 50% of 20 ounces then:x + y = 200.20x +

0.70y = 0.50(20)From the 1st equation solve for xx = 20 - ySubstitute it to

the 2nd equation0.2(20-y) + 0.7y = 104 - 0.2y + 0.7y = 100.5y = 10-40.5y =

6y = 12Substitute to x = 20 - yx = 20 - 12x = 8