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March 24th, 2010, 08:53 PM   #1
Joined: Mar 2010

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trying to make a solution (liquid solution...) problem...

Ok, I am definitely victim to the use it or lose it crowd when it comes to math. This is a simple problem but I'm lacking the confidence my logic with it.

so, I want to make a 3L solution.

To make a 1L solution, I add 100mL of this 10X reagent with 900mL of water.
I must then add 700g of a powder to this solution. In the end, the final volume comes out to be 1400mL.

For the sake of my own curiosity, how do I go about solving this?

Here's what I've reasoned...

700g for 1400mL
to make 3000mL, 3000/1400 = 2.14

700g x 2.14 = 1498g

100 x 2.14 = 214mL of 10x soln
900 x 2.14 = 1926mL of water
~~~~ with the outrageous amount of powder, I should get 3L.

Am I right or wrong? Please help me out with this. thanks
TreeTruffle is offline  
March 25th, 2010, 04:22 PM   #2
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Re: trying to make a solution (liquid solution...) problem...

If I understood your reasoning, wherein the fundamental idea was that 2.14 time the original volume requires 2.14 the original ingredients, I agree with you.
jason.spade is offline  
March 27th, 2010, 02:22 AM   #3
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Hi TreeTruffle, if you've already posted a problem elsewhere, please provide a link instead of a duplicate post, so that we don't just tell you what you've already been told on the other site.
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