ffrank at rz.uni-potsdam.de (Frank =?iso-8859-1?q?F=FCrst?=) wrote:
>dk at no.email.thankstospam.net (D.K.) schrieb:
>>> I might have a glaring hole in my education but this is first time in
>> my life I hear about difficulties measuring pH ~ 1.5 with a properly
>> calibrated pH-meter. Is there a problem? What kind? Would you
>> similarly say that pH 12 is unreliable?
>>At high pH you get an error because the electrode will respond to Na+ or
>Li+ (it's called "Alkali-Fehler" in german, "alkali error" or something
>like that). But I also have never heard of an error at low pH.
Yes, this effect is easy to understand. Although I doubt it is significant
at pH 12 - IIRC, most electrodes' specs claim linear response to 12.
DK
