Activity (chemistry) - Example Values

Example Values

Example values of activity coefficients of sodium chloride in aqueous solution are given in the table. In an ideal solution, these values would all be unity. The deviations tend to become larger with increasing molality and temperature, but with some exceptions.

Molality (mol/kg) 25 °C 50 °C 100 °C 200 °C 300 °C 350 °C
0.05 0.820 0.814 0.794 0.725 0.592 0.473
0.50 0.680 0.675 0.644 0.619 0.322 0.182
2.00 0.669 0.675 0.641 0.450 0.212 0.074
5.00 0.873 0.886 0.803 0.466 0.167 0.044

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