87.4 Activity and activity coefficient 1. Concepts For a salt with general formula Mu x M X vM+yX 1=V+H4+v 4=+ rTIn a4=12+ RTIn ym=4°+RTna=°+ RTIn y-m u=(vux+vu+RTInyr'+rtInm m Definition: b+=y+ m*=mm-Iv=v++v u=(vur+v_u)+vRTIn++vRTInm Molality-scale mean ionic activity coefficient C. Levine pp 295-297For a salt with general formula Mv+Xv-  = + + + − − v v     RT a RT m ln ln + + + + + + = + = +     RT a RT m ln ln − − − − − − = + = + ( ) ln ln v v v v      v v RT RT m m + − + − = + + + + + − − + − + − Definition: + −  = + − v v v    + −  = + − v v v m m m = + + − v v v     = + + + ( ) ln ln v v vRT vRT m + + − −   Cf. Levine pp. 295-297 Molality-scale mean ionic activity coefficient 1. Concepts §7.4 Activity and activity coefficient