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KH vs. alkalinity

Paul wrote:

>        What do we mean here by "KH", anyway?  I understood it to mean
>the (bi)carbonate present, but it seems that people have of late been
>using it to mean _all_ the weak acid anions, i.e., "alkalinity".

I think Paul has made an important point.  I think what may confuse some
people is that even though we talk about KH, most "KH" test kits _actually_
measure alkalinity.  This means they are pretty accurate if there are not
other buffers in the brew, but are less accurate the more other "stuff"
that is added. (How's that for technical chemistry language, Paul? ;-)