4. The second-order rate constant for the alkaline hydrolysis reaction of ethyl formate in a 90% aqueous solution of ethyl alcohol at 20.86 C is 4.5 l*mol-1*s-1.
a) What is the half-life if both reactants have the same concentration of 0.05 M?
b) If the concentration of one of the reactants is doubled and the concentration of the other is halved, how long will it take for half of the substance with the lower concentration to react?
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