Electromotive force measurements of the cell

Na-ISE|polyelectrolyte( mp(mono) )

NaCl( ma)|AgCl

Ag

are carried out at the different molalities of NaCl in aqueous poly(diallydimethylammonium chloride)(PDADMAC)and poly(anetholesulfonic acid

sodium salt)(PAS) solutions at 308.15 K. The mean activity coefficients of NaCl in aqueous polyelectrolyte solutions are determined by using the standard cell potential which are obtained from the measurements of the electromotive force of cell

Na-ISE| NaCl( m )|AgCl

Ag

combining with the Pitzer model for electrolyte solution.At different concentrations of PDADMAC solution

the mean activity coefficients of NaCl decrease monotonically as the concentrations of NaCl increase.However

for the aqueous solutions of PAS

there is a maximum value as the concentrations of NaCl increase.