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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: MDC lab on June 05, 2020, 06:04:51 AM

Title: mixture of NaCl and Na2SO4
Post by: MDC lab on June 05, 2020, 06:04:51 AM

how to analyse sodium suphate in mixture of sodium chloride and sodium sulphate without gravimatric analysis. is there any analytical method?

Title: Re: mixture of NaCl and Na2SO4
Post by: AWK on June 05, 2020, 07:10:55 AM

And what other methods of quantitative analysis do you know?

Title: Re: mixture of NaCl and Na2SO4
Post by: MDC lab on June 06, 2020, 01:37:38 AM

i know only precipitation method with barium chloride. but i want to know titration method, i search on google but can't find. please help

Title: Re: mixture of NaCl and Na2SO4
Post by: shchavel on June 06, 2020, 02:12:03 AM

Classic method for sodium chloride assay - AgNO3 titration. But you need potentiometric electrode for this.  But it also persiptate method) I think gravimetric much easy, if don't have titration eqiupment.

Title: Re: mixture of NaCl and Na2SO4
Post by: MDC lab on June 06, 2020, 02:45:52 AM

Quote from: shchavel on June 06, 2020, 02:12:03 AM

Classic method for sodium chloride assay - AgNO3 titration. But you need potentiometric electrode for this.  But it also persiptate method) I think gravimetric much easy, if don't have titration eqiupment.

I want assay sodium sulphate not sodium chloride.

Title: Re: mixture of NaCl and Na2SO4
Post by: AWK on June 06, 2020, 04:04:08 AM

Quote from: kailash on June 06, 2020, 01:37:38 AM

i know only precipitation method with barium chloride. but i want to know titration method, i search on google but can't find. please help

Search under barium titrimetric analysis.

Title: Re: mixture of NaCl and Na2SO4
Post by: Borek on June 06, 2020, 04:21:59 AM

If the mixture contains only two substances determining percentage of one means you know the composition.

This is rarely the case in normal samples, but you have not explained if it is a theoretical, made up example, or real life problem, and what are assumptions.

Title: Re: mixture of NaCl and Na2SO4
Post by: Borek on June 06, 2020, 04:23:11 AM

Quote from: shchavel on June 06, 2020, 02:12:03 AM

Classic method for sodium chloride assay - AgNO3 titration. But you need potentiometric electrode for this.

No, you don't need potentiometric electrode.

http://www.titrations.info/precipitation-titration-argentometry-chlorides-Mohr
http://www.titrations.info/precipitation-titration-argentometry-chlorides-Volhard

Title: Re: mixture of NaCl and Na2SO4
Post by: shchavel on June 14, 2020, 02:06:02 PM

O, thanks! You're right, Borek!
I forget about indicators methods.