First order reaction
The half-life of a reaction is the time in which the concentration of a reactant is reduced to half of its initial concentration. It is represented as t1/2.
We know that, for a first-order reaction,
k = rate constant of first order reaction
t = time
R’ = initial concentration of reactant
R = concentration of reactant
Now at half life, R = R’/2 ( according to above definition )
(∵ log2 = 0.301)
hence, its independent of concentration.
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