3. The following pH values of a monobasic weak acid were measured:
C, mol/l 0.01 0.05 0.08 0.10 0.20 0.50
pH 3.849 3.500 3.400 3.350 3.200 3.000
Calculate the Kd value and pH of a 0.12 mol/L solution of this acid.
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