Question 1171977: I have 6 liters of 50% acid solution. how many liters of 35% acid solution what I need to add to get a 40% acid solution? Answer by ikleyn(52781) (Show Source):
Let x be the volume of the 35% solution to add (in liters).
Then you have this equation for the pure acid amount
0.5*6 + 0.35x = 0.4*(6 + x)
It says that the volume of the pure acid in the mixture is the sum of the volumes of the pure acid in ingredients.
From the equation, x = = 12.
ANSWER. 12 liters of the 35% acid solution should be added.
