Thermodynamic Properties of the Mixed Electrolyte [(1-y)NaCl+yNaNO3] in Mixed Solvent ( Formamide +Water) System at T=298.2K

In this work, the thermodynamic properties of the mixed electrolyte [(1-y)NaCl+y NaNO3] in mixed (formamide +water) system ,using the potentiometric method, are reported. The potentiometric measurements were carried out on the galvanic cells without liquid junction of the type: Na–ISE / NaCl (m1), NaNO3 (m2), (100-w%) H2O +w% HCONH2 / Ag-AgCl, Na–ISE / NaNO3 (m1), (100-w %) H2O +w% HCONH2 / NO3–ISE over total ionic strengths from 0.001 to 4.000 mol. kg-1 for different series of salt molal ratios r (r = mNaCl/mNaNO3 =0.1, 1, 2.5, 5.0, 10.0) and pure NaCl in mixed solvent system containing 10% mass fraction of formamide at T=298.2 K. The results obtained were interpreted by using Pitzer ion-interaction model.

کلیدواژه ها:

Activity coefficient ، Pitzer model ، NaCl ، NaNO3 ، emf method