Re: what is buffer concentration?
From: Bob (bbx107_at_excite.com)
Date: 03/26/05
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Date: Fri, 25 Mar 2005 19:24:11 -0800
On 25 Mar 2005 19:34:41 -0600,
gllrmrtfld@yahoo-dot-com.no-spam.invalid (Guillermo) wrote:
>What is 1M buffer solution?
>
>Is 1M ethanoic buffer something with [CH3COOH]+[CH3COO-]=1M?
yes
>
>I am asking because if it is both concentrations together it is no
>possible to prepare ethanoic buffer pH=5 from 1M ethanoic acid and 1M
>NaOH - it is stupid and very complicated then.
One way is to prepare 1 M each of the acid and base forms (ethanoic
acid and sodium ethanoate in your case). Mix them to the desired pH;
the buffer conc will be 1 M regardless of the volumes of each.
Another way is to use 1 M ethanoic acid plus "very concentrated" NaOH,
so that the base has "little" effect on the volume. That may not be
sufficient in this case.
Another way... Start with 500 mL 2 M ethanoic acid, titrate to desired
pH with base, then bring the final volume to 1 L, which gives you 1 M
buffer. (You need to check that the pH is still ok, but that usually
is not a big problem.)
Did you really mean 1 M buffer? That is rather concentrated. In any
case, ideas are the same.
bob
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