## Half life- zero order

$\frac{d[R]}{dt}=-k[R]; \ln [R]=-kt + \ln [R]_{0}; t_{\frac{1}{2}}=\frac{0.693}{k}$

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Jasmin Argueta 1K
Posts: 69
Joined: Fri Sep 28, 2018 12:16 am

### Half life- zero order

Does anyone understand why the half life concentration in zero order reactions is dependent of the reaction concentration, while first order reactions are independent of the reaction concentration. I understand there is an [A] in the half life reaction for zero order reactions, but why is it need conceptually (beyond the [A] being included in the equation)

Sam Joslyn 1G
Posts: 34
Joined: Fri Sep 28, 2018 12:20 am

### Re: Half life- zero order

If a reaction is zero-order, it means that the rate is unaffected by the concentration of the reactant. Therefore, since rate determines half-life, if the reaction is zero-oder, that reactant has no effect on the half-life value.

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