Problema Solution
A chemist has a solution that is 40% acid and another solution that is 90% acid. He wants to make 100 mL of a 70% acid solution how many mL of each solution should he use?
Answer provided by our tutors
Let
x = mL of the 40% acid solution
y = mL of the 90% acid solution
x + y = 100
0.40x + 0.90y = 0.70*100
........
click here to see the system of equations solved for x and y
........
x = 40 mL
y = 60 mL
40 mL of 40% acid solution and 60 mL of 90% acid solution are needed to make 100 mL the 70% acid solution.