Wine Analysis
Percentage (%) concentration of FSO
2
forms (SO
2
, HSO
3
-
,& SO
3
=
) at different pH values
When
sulphur dioxide
is added to juice or wine, the portion that exists as
FSO
2
will be converted to the
different forms
of FSO
2
as shown by the
equation
and
graph
.
Their concentrations are determined by the relevant
disassociation constants
and the
pH of the juice or wine
. (
see graph
and
calculations
)
As the dissociation constant is constant at a given temperature, it is the
pH
that will determine the percentage of FSO
2
forms and hence pH is an important aspect of wine production.
