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Author Topic: Preparation of 1N H2SO4  (Read 35001 times)

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lingo_belle

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Preparation of 1N H2SO4
« on: February 03, 2008, 02:36:52 AM »

hi all,

would like to know how should I prepare 1N of H2SO4 from 98% concentrated H2SO4? Thanks very much!
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Kryolith

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Re: Preparation of 1N H2SO4
« Reply #1 on: February 03, 2008, 02:49:40 AM »

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
« Last Edit: February 03, 2008, 03:00:38 AM by Kryolith »
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Borek

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Re: Preparation of 1N H2SO4
« Reply #2 on: February 03, 2008, 03:50:36 AM »

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Kryolith

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Re: Preparation of 1N H2SO4
« Reply #3 on: February 03, 2008, 04:03:59 AM »

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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lingo_belle

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Re: Preparation of 1N H2SO4
« Reply #4 on: February 03, 2008, 11:53:15 PM »

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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Kryolith

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Re: Preparation of 1N H2SO4
« Reply #5 on: February 03, 2008, 11:58:42 PM »

1 N H2SO4 is 0.5 M regarding H+ and 1 M regarding SO42-
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Borek

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Re: Preparation of 1N H2SO4
« Reply #6 on: February 04, 2008, 12:56:51 AM »

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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lingo_belle

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Re: Preparation of 1N H2SO4
« Reply #7 on: February 11, 2008, 11:33:36 PM »

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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Borek

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Re: Preparation of 1N H2SO4
« Reply #8 on: February 12, 2008, 12:57:35 AM »

Do I make use of the density, 1.84g/ml?

Yes.
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JGK

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Re: Preparation of 1N H2SO4
« Reply #9 on: February 12, 2008, 02:30:16 AM »

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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AWK

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Re: Preparation of 1N H2SO4
« Reply #10 on: February 12, 2008, 02:38:53 AM »

1.84 g/cm3 = 1.84 kg/dm3 = 1.84 Mg/m3
hence, in fact, this unit of density is the SI unit
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