September 16, 2021, 10:54:35 AM
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Topic: NaOH + KCl buffer solution  (Read 68 times)

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Offline Orcio_Dojek

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NaOH + KCl buffer solution
« on: Yesterday at 08:20:17 AM »
I found this recipe:

http://delloyd.50megs.com/moreinfo/buffers2.html

12 mL 0,2 M NaOH + 50 mL 0,2 KCl = pH 12,00

Years ago it was advised by National Bureau of Standards in US.

Question is - NaOH absorbs CO2 from the air.

Does this solution need to be used as soon as made - OR - after some time (4 - 10 hours), because it NEEDS to absorb some amount of CO2 ?

Offline Borek

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Re: NaOH + KCl buffer solution
« Reply #1 on: Yesterday at 12:30:53 PM »
Atmospheric CO2 absorption is way too unpredictable to be part of a reliable procedure.

But there is definitely something wrong here, I would expect pH of the solution to be around 12.4, not 12.0.
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