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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: lingo_belle on February 03, 2008, 08:36:52 AM

Title: Preparation of 1N H2SO4
Post by: lingo_belle on February 03, 2008, 08:36:52 AM

hi all,

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

Title: Re: Preparation of 1N H2SO4
Post by: Kryolith on February 03, 2008, 08:49:40 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

Title: Re: Preparation of 1N H2SO4
Post by: Borek on February 03, 2008, 09:50:36 AM

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

Title: Re: Preparation of 1N H2SO4
Post by: Kryolith on February 03, 2008, 10:03:59 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.

Title: Re: Preparation of 1N H2SO4
Post by: lingo_belle on February 04, 2008, 05:53:15 AM

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! :)

Title: Re: Preparation of 1N H2SO4
Post by: Kryolith on February 04, 2008, 05:58:42 AM

1 N H₂SO₄ is 0.5 M regarding H⁺ and 1 M regarding SO₄^2-

Title: Re: Preparation of 1N H2SO4
Post by: Borek on February 04, 2008, 06:56:51 AM

Quote from: lingo_belle on February 04, 2008, 05:53:15 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

Title: Re: Preparation of 1N H2SO4
Post by: lingo_belle on February 12, 2008, 05:33:36 AM

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

Title: Re: Preparation of 1N H2SO4
Post by: Borek on February 12, 2008, 06:57:35 AM

Quote from: lingo_belle on February 12, 2008, 05:33:36 AM

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

Yes.

Title: Re: Preparation of 1N H2SO4
Post by: JGK on February 12, 2008, 08:30:16 AM

Quote from: Kryolith on February 03, 2008, 10:03:59 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.

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  :-\

Title: Re: Preparation of 1N H2SO4
Post by: AWK on February 12, 2008, 08:38:53 AM

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