Michael has 10 liters of an 80% acid solution. How many liters of water should she add to form a 40% acid solution?

I got 360! O.o

Question

Michael has 10 liters of an 80% acid solution. How many liters of water should she add to form a 40% acid solution?

I got 360! O.o

anonymous · Answer

10 liter

you start with 8 liter acid, 2 liter water...
you need 8 liter acid and 12 liter water. (8/20 = 0.4)

aroub · Answer

Umm.. how did you get that? I mean is there any 'rule' or something? because I use the 'table' Do you know it?

anonymous · Answer

I don't know that table.... I just figured that to reduce the concentration by a factor 2, you need 2 times as much water as your initial liquid amount

aroub · Answer

Hmmm, okay thank you :)

hero · Answer

Whatever happened to using the beaker method?

aroub · Answer

lol, I'm using it...but NOT in this question! :)

hero · Answer

Why NOT!!

hero · Answer

Put it all in the same terms remember. If you're adding water, you have to translate everything to water first before adding.

hero · Answer

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