SOLUTION: how many liters of a 90% acid solution must be added to 6 liters of a 15% acid solution to obtain a 40% acid solution ?

Question 44394: how many liters of a 90% acid solution must be added to 6 liters of a 15% acid solution to obtain a 40% acid solution ?

Answer by adamchapman(301) (Show Source): You can put this solution on YOUR website!
Let the amount of litres of 90% acid solution be called "x".
We know the finalsolution will have a 40% acid solution and will be 6+x litres in volume.
Multiplying volumes by solutions, where the percentage of acid concentration is in decimal form (i.e. 0.5=50%):

Now rearrange to get x:

So 3 liters of a 90% acid solution must be added to 6 liters of a 15% acid solution to obtain a 40% acid solution.

I hope this helps.
P.S. I am trying to start up my own homework help website. I would be extremely grateful if you would e-mail me some feedback on the help you received to adam.chapman@student.manchester.ac.uk

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