The iodination of acetone is catalyzed by the proton and monochloroacetic acid (general acid catalysis), the reaction in water being negligible. For monochloroacetic acid CH2ClCOOH the acid dissociation constant is 1.5510 mol dm . The data of rate constants were obtained as a function of the concentration of monochloroacetic acid from the table. Determine the catalytic constants ( k=k _H [H ]+k _AH[CH₂ClCOOH] ).

\begin{tabular}{|c|c|} \hline c(mol/L) & k1018s1 \\ \hline 0.05 & 7.67 \\ \hline 0.1 & 12.7 \\ \hline 0.2 & 19.8 \\ \hline 0.5 & 39.7 \\ \hline 1 & 66.8 \\ \hline \end{tabular}