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anonymous
 one year ago
Please help...........
Suppose we start with unlimited supplies of a 20% h2so4 solution and of a 50% h2so4 solution. We combine x liters of the first with y liters of the second to produce 7 liters of a 40% h2so4 solution. What does x equal?
anonymous
 one year ago
Please help........... Suppose we start with unlimited supplies of a 20% h2so4 solution and of a 50% h2so4 solution. We combine x liters of the first with y liters of the second to produce 7 liters of a 40% h2so4 solution. What does x equal?

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welshfella
 one year ago
Best ResponseYou've already chosen the best response.0work in masses of pure sulphuric acid the mass of acid in 40% solution is 7 * 10 * 40 = 2800g

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0x liters of 20% contains 200x g y liters of 50% = 500y g

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0so 200x + 500y = 2800

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0now we need to find y in terms of x. Note that the 50% solution i s 5/2 = 2.5 times as strong as the 20% So y liters of 50% = how many liters of 20%?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0where did u get the 5/2?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0the ratio of 50/20 = 2/2

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0so y liters of 50% = 2.5x liters of 20%

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0200x + 500*2.5x = 2800 solve for x

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0hmmmm it's supposed to be 2.33333333

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0oh yes I've gone wrong somewhere

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0something wrong in my logic somewhere

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1set up 2 equations... x + y = 7 20x + 50y = (40)(7)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0hmmm and then plug it in huh? y=7x

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0yea thats an easier way to do it. I still can't see what i did wrong . Worrying !

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0200x + 500y = 2800 was correct then next step was to replace y with 7  x

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0 that is y in tems of x.

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0I had a mental aberration!
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