21. Calculate the average values ​​of the acidity constant of acetic acid and the basicity constant of CH3COO- ions based on the electrical conductivity measurements of a cell filled with aqueous CH3COOH solutions at a temperature of 25 C.
R, Ohm 890 1250 1610 2830 4015 5195
C, mol/m3 100 50 30 10 5 3
The resistance of a cell filled with a KCl solution (C(KCl)=100 mol/m3) at the same temperature is 35.3 Ohm.

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