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y grams of water were added to the 90 grams of a strong

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Manager
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y grams of water were added to the 90 grams of a strong [#permalink]

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New post 10 Oct 2008, 19:03
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

y grams of water were added to the 90 grams of a strong solution of acid. As a result, the concentration of acid in the solution became 1/3 times of the intial concentration. What was the concentration of acid in the original solution?

Doesn't it means that its 100% acid?
Thamks

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Re: what is strong? [#permalink]

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New post 14 Oct 2008, 06:51
what are the answer choices ?
Moreover, how can the concentration become 100 % acid ? Its written that y gms of WATER is mixed .... not another solution with acid .

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Re: what is strong? [#permalink]

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New post 14 Oct 2008, 07:14
To be exact, "the strong solution of acid" in the question doesn't give you any numbers to work with. We don't know how strong it is. We just know it is strong. This doesn't cut it! We can't solve the problem unless the we can find out what the initial concentration of acid is.

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Re: what is strong?   [#permalink] 14 Oct 2008, 07:14
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y grams of water were added to the 90 grams of a strong

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