In the restricted range of dilute aqueous solutions having
amount concentrations less than
and being neither strongly acidic nor strongly alkaline
(
).
where
is the mean ionic
activity coefficient of a typical univalent electrolyte on a concentration basis. The operational definition is based on the
electromotive force measurement of the galvanic cell:
where the
KCl
solution has a molality greater than
relative to a
standard solution S, replacing X in the scheme above
[usually
KH2PO4
(aq) of molality
which has a
].
.
Source:
PAC, 1996, 68, 957
(Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996))
on page 986
See also:
PAC, 1990, 62, 2167
(Glossary of atmospheric chemistry terms (Recommendations 1990))
on page 2205
PAC, 1984, 56, 567
(Physicochemical quantities and units in clinical chemistry with special emphasis on activities and activity coefficients (Recommendations 1983))
on page 569
