6. Calculate the average value of the ion-exchange equilibrium constant described by the Nikolsky equation using the data on the replacement of calcium ions from the soil by sodium ions from the sodium salt solution:
Equilibrium concentration in solution, mmol/l:
Na 3.26 6.60 13.80 21.25
Ca 37.84 36.72 34.62 31.87
Adsorption of A*102 on soil, mol/kg:
Na 0.28 0.60 1.20 1.89
Ca 39.72 39.56 39.40 38.68

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