Preferred Label : mean activity of an electrolyte in solution;
IUPAC definition : Defined by the equation: \[a_{\pm } \mathrm{e} {(μ _{{B}}- μ _{{B}} {\unicode{x29B5}})\
\nu \ R\ T}\] where µ B is the chemical potential of the solute B in a solution containing
B and other species. The nature of B must be clearly stated: it is taken as a group
of ions of two kinds carrying an equal number of positive and negative charges, e.g.
Na sup class plus /sup NO sub 3 /sub sup class minus /sup or Ba sup 2 /sup
2Cl sup class minus /sup or 2Al sup 3 /sup 3SO sub 4 /sub sup 2 /sup . v
is the total number of ions making up the group i.e. 2, 3 and 5 respectively in the
above examples. µ B is the chemical potential of B in its standard state, usually
the hypothetical ideal solution of concentration 1 mol kg-1 and at the same temperature
and pressure as the solution under consideration.;
Origin ID : M03774;
See also
Defined by the equation: \[a_{\pm } \mathrm{e} {(μ _{{B}}- μ _{{B}} {\unicode{x29B5}})\
\nu \ R\ T}\] where µ B is the chemical potential of the solute B in a solution containing
B and other species. The nature of B must be clearly stated: it is taken as a group
of ions of two kinds carrying an equal number of positive and negative charges, e.g.
Na sup class plus /sup NO sub 3 /sub sup class minus /sup or Ba sup 2 /sup
2Cl sup class minus /sup or 2Al sup 3 /sup 3SO sub 4 /sub sup 2 /sup . v
is the total number of ions making up the group i.e. 2, 3 and 5 respectively in the
above examples. µ B is the chemical potential of B in its standard state, usually
the hypothetical ideal solution of concentration 1 mol kg-1 and at the same temperature
and pressure as the solution under consideration.
