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pH shift in ammonium formate buffer

Posted: Mon Aug 13, 2012 5:58 pm
by zhouxq
Hi,

Any body oberves this kind phenomenon ?--pH shift in an ammonium formate buffer ?
A water solution with 20 mM ammonium formate buffer, adjusted pH by formic
acid to pH 6.0, within 2-3 days, pH is increased to 6.2 ~6.3 range.

???

Ed

Re: pH shift in ammonium formate buffer

Posted: Mon Aug 13, 2012 6:05 pm
by tom jupille
Since ammonium formate is not a buffer at pH 6 (check the pKa values of formic acid and ammonia, respectively), it's not surprising at all.