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Topic: Molarity problem  (Read 2720 times)

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Offline Eddy1

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Molarity problem
« on: March 22, 2009, 10:44:58 PM »
I'm stuck figuring out the grams in Molarity

Ex. How many grams of potassium carbonate are needed to make 200 mL of a 2.5M solution

and

how man grams of ammonium sulfate are needed to make a .25M solution at a concentration of 6 M

Please help = (
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Offline UG

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Re: Molarity problem
« Reply #1 on: March 22, 2009, 10:50:52 PM »
Well you know that n=cV
and you've got both the conc. and the volume so you can figure out n.

Then you know that m=nM
and you should be able to work it out.  :)
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