Chemical Forums
Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: lingo_belle on February 03, 2008, 08:36:52 AM
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hi all,
would like to know how should I prepare 1N of H2SO4 from 98% concentrated H2SO4? Thanks very much!
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Welcome to the forum :)
1 N H2SO4 = 0.5 M H2SO4
Procedure to prepare 1 L:
=> You need 0.5 moles H2SO4 for 1 L of the solution
=> Calculate the mass for 0.5 moles H2SO4
=> Consider the concentration (98 %)
=> Prepare ~ 900 ml water and then add slowly H2SO4 (exothermic reaction!)
=> Fill up to 1 L
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1N against what?
http://www.chembuddy.com/?left=concentration&right=normality
once you know if you need 1M or 0.5M
http://www.chembuddy.com/?left=CASC&right=solution_preparation
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You're absolutely right Borek. If somebody talks about 1N H2SO4 without any further descriptions, 1 N commonly refers to the H+ concentration. However one should always use molarity nowadays to avoid ambiguities.
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hi all,
thx for the help. However, Borak & Kryolith, my I check with both of you the meaning of 1N against wat? Please pardon me if I sound silly, however, isn't 1N H2SO4 naturally refers to 0.5M? Pls advise.
Thx again! :)
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1 N H2SO4 is 0.5 M regarding H+ and 1 M regarding SO42-
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thx for the help. However, Borak & Kryolith, my I check with both of you the meaning of 1N against wat? Please pardon me if I sound silly, however, isn't 1N H2SO4 naturally refers to 0.5M?
Read explanation at the link provided.
http://www.chembuddy.com/?left=concentration&right=normality
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thx all for your help.
another silly question, I know that I should weigh 49g of H2SO4 to make up 1L of 1N H2SO4 solution (0.5M). How do I convert this weight into volume? Do I make use of the density, 1.84g/ml?
Thx much
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Do I make use of the density, 1.84g/ml?
Yes.
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You're absolutely right Borek. If somebody talks about 1N H2SO4 without any further descriptions, 1 N commonly refers to the H+ concentration. However one should always use molarity nowadays to avoid ambiguities.
I think one of the first things you need to learn as a chemist is that uniformity is a myth. 99% of the work I do does not involve SI units or standard terms.
You learn to live with it .. eventually :-\
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1.84 g/cm3 = 1.84 kg/dm3 = 1.84 Mg/m3
hence, in fact, this unit of density is the SI unit