Homework Help: Chemistry

Posted by Maddy on Saturday, March 31, 2012 at 9:25pm.

I am having trouble answering this. please help!
Q: Cereol is a newly discovered compound in corn flakes. A biologist suspects that it increases mental ability. She is making a solution to test on rats.
First she makes a stock solution. She discovers that this is too concentrated, when the rats go on strike unless they are given french cheese. She takes 1 mL of the stock solution and dilutes it to 25 mL. She then dilutes this solution further, by taking 4 ml of the diluted solution and diluting it to a final volume of 250 mL.

How many times more concentrated is the original stock solution compared to the final dilutedsolution?

Chemistry - DrBob222, Saturday, March 31, 2012 at 9:48pm
Let A = original concn.
New concn = A x (1/25) x (4/250) = ?

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