Why is t1/2 independent of reactant concentration
for a first order reaction?
ln ([A]0/[A]t) = kt
After one half-life, t = t1/2 and [A]t = 0.5[A]0. Substituting.....
ln ([A]0/0.5([A]0) = kt1/2
or
ln 2 = kt1/2
t1/2 = (ln 2)/k = 0.693/k
first order reaction: A B
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