Question

What amount of pure acid must be added to 300 mL of a 50% acid solution to produce a 70% acid solution?

Answer 1

You are going to add 120 mL because 50%=300 so 20 percent of 600=120

Answer 2

You need add 60 mL

Explanation:

10% = 0.10

300 x 0.10 = 30

70% - 50% = 20%

30 x 2 = 60

60 mL