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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: gkasparis on April 20, 2016, 01:35:13 PM

Title: sodium hydroxide elimination
Post by: gkasparis on April 20, 2016, 01:35:13 PM

Hi all

How could I eliminate sodium hydroxide from a solution of sodium decanoate and sodium hydroxide. You see i am trying to synthesise a series of fatty acid salts from their parent acids and sodium hydroxide.

Thank you

Title: Re: sodium hydroxide elimination
Post by: kriggy on April 20, 2016, 03:27:45 PM

I think your salt will have rather low solubility in water compared to hydroxide so you could possibly extract it away

Title: Re: sodium hydroxide elimination
Post by: Dan on April 22, 2016, 02:47:02 AM

It would be easier to remove an excess of the carboxylic acid than an excess of NaOH; if you use NaOH as the limiting reagent, the excess carboxylic acid is easily removed by washing.

Title: Re: sodium hydroxide elimination
Post by: gkasparis on April 23, 2016, 08:00:19 PM

The salt is water dispersible, it forms micelles. An excess of acid would indeed solve most of the problems.

Thanks for your replies

Title: Re: sodium hydroxide elimination
Post by: orgopete on April 24, 2016, 12:23:28 AM

Adjust the pH after hydrolysis?