Answer:
0.133 ml
Explanation:
The two available solutions to be used in the mixture are a 70% solution and a 85% solution .
x = volume of 70% solution
y = volume of 85% solution
y = 2 ml
Therefore;
0.7 x + 0.85(2) = 0.75(x+2)
0.7x + 1.7 = 0.75x + 1.5
multiply through by 10 to get rid of the decimals
7x + 17 = 7.5x +15
collecting and simplifying
-0.5 x = -0.2
divide both sides by -1.5
x = -0.2/-1.5
x = 2/15 ml or 0.1333 ml