How do you make 2 percent solution from 37 percent solution?

Answer 1

Let's assume you have 1 L of the 37% solution by volume of chemical A. So your solution would contain 0.37 L of A & 0.63 L of water.

0.37 L of A / (0.37 L of A + 0.63 L of water) = 37% solution of A

Obviously in order to dilute the solution to 2% we have to add water. Now we need to figure out how much. We'll call it X. So you set up the ratio as follows & solve for X.

0.37 / (0.37 + 0.36 + X ) = 0.02

0.37 = 0.02 (1.00 + X)

0.37 = 0.02 + 0.02X

0.37 - 0.02 = 0.02 + 0.02X - 0.02

0.35 = 0.02X

0.35/0.02 = X

X = 17.5, so you would have to add 17.5 L of water to the originial 37% solution to dilute it to 2%.

Obviously this answer will change depending on how much of the 37% solution you have to start with but the procedure to figure it out is still the same.