38. Solving a chemistry problem
142. The rate constant of the hydrolysis reaction of a pesticide at 18 C is 4.3*10-6 min-1. The initial concentration of the pesticide in the water sample is 0.05 mol/l. How long will it take for the concentration of the substance to decrease to: a) 0.01 mol/l; b) 0.025 mol/l?
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