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Sodium Acetate Buffer pH 5.2


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#1 KayleighEpps

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Posted 17 December 2013 - 09:05 AM

Hi!

 

Does anybody have any specific protocol/recipe for a 3M Sodium Acetate buffer at pH 5.2? I normally dissolve anhydrous sodium-acetate in 150mL of distilled water, adjust the pH with glacial acetic acid (17.416M) and then make it up to 250mL using water but I was wondering if there's a specific way to do it based on pH/pKa calculations rather than having to titrate the acetate in and monitor it via a pH meter. 

 

Thanks!

 

- Kayleigh



#2 hobglobin

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Posted 17 December 2013 - 11:59 AM

I've a recipe of 10.5 mL 0.2 M acetic acid solution, 39.5 mL sodium acetate solution and 50 mL water which gives a buffer with pH 5.2. Anyway it's always strongly recommended to check the pH finally and adjust if something is wrong (solutions may be wrongly made, volume errors etc) ...


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#3 labtastic

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Posted 10 January 2014 - 06:33 AM

Don't make it so complicated. Trying to avoid using a pH meter just makes your life more difficult.

 

1. Make a 3 M sodium acetate solution.

2. Make a 3 M acetic acid solution.

3. Add acetic acid solution to sodium acetate solution (while stirring) until pH is 5.2.  


Edited by labtastic, 10 January 2014 - 06:35 AM.


#4 Borek

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Posted 31 January 2014 - 02:21 PM

3M solution is way too concentrated for easy calculations (ionic strength starts to play an important role). You can try to calculate buffer composition using thermodynamically corrected pKa value for IS=3 (which is listed as 5.015 in Kotrly and Sucha book). At least it could mean much shorter titration.






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