"Rob" > wrote in message
om...
> Make *all* your measurements before adding anything - it makes for
> more consistency in your measurements batch-to-batch. I don't think
> that the addition of sugar will make too much difference to the
> acidity/pH of the must, and certainly not enough to greatly affect
> what you'll need to add. Mix well, and then if you plan on making
> confirmatory measurements, do it after you've made all the adjustments
> you think you need.

<snip>

Hi Rob

Novices might find this a little confusing, so let me please add a short
explanation here.

TA and pH are measures of *concentration* (not quantity). Thus,
anytime that you add something that increases the *volume* of the
must, the "quantity" of acid present remains the same, but the
"concentration" changes. Which of course is why dilution can be
used to adjust acidity. HTMS