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Topic: Chemistry calculation on Methyl Ethanoate  (Read 1877 times)

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Offline Copyright

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Chemistry calculation on Methyl Ethanoate
« on: February 09, 2013, 09:15:32 PM »
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Okay so heres the question

To prepare 25 ml of a 50 mM solution of the ester methyl ethanoate, what volume of methyl ethanoate (in µl) should be dissolved in water

methyl ethanoate density = 0.93 g/ml

so far what i've done is:

50 mM = 0.05 M

1 ml of methyl ethanoate = 0.93g
25 ml of methyl ethanoate = 23.25g
RMM of methyl ethanoate: 74

Moles = 23.25/74 = 0.314

Volumme (L/dm^3) = 0.314/0.05 = 2.68 L

which can't be right
My chemistry isnt great so if anyone has any advice?

Offline discodermolide

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Re: Chemistry calculation on Methyl Ethanoate
« Reply #1 on: February 10, 2013, 03:39:58 AM »
A 0.05M solution means 0.05mol in 1000 mL of solvent.
So how many moles are in 25 mL?
Knowing that and the density should allow you to work out the volume you must measure out.
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