51. For the reaction of saponification of acetic methyl ester with alkali, a solution was taken with the same concentrations of alkali and ether, equal to 0.01 mol / l. The alkali concentration changed over time as follows:

Time, min: 3 5 7 10 15
Concentration, mol/l *103 7.40 6.34 5.50 4.64 3.63

Determine the order of the reaction, the rate constant.

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