## initial concentration

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

Briana Yik 1H
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Joined: Fri Sep 28, 2018 12:20 am

### initial concentration

Why do zero order reactions not depend on the initial concentrations?

Melissa Bu 1B
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Joined: Fri Sep 28, 2018 12:19 am

### Re: initial concentration

The characteristic of zero order reactions is that they occur at a rate that is independent of the initial concentration. No matter how much of a reactant you have initially, the reaction will proceed at the same rate (that of the rate constant, k).

Dimitri Speron 1C
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### Re: initial concentration

This can be for a number of reasons. The one that Lavelle specifically mentioned in class is that the reaction is dependent on an enzyme or catalyst rather than on the concentration of reactants.

Jason Ye 2I
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Joined: Fri Sep 28, 2018 12:22 am

### Re: initial concentration

The reactant concentrations just dont affect rate.

Posts: 59
Joined: Fri Apr 06, 2018 11:04 am

### Re: initial concentration

I found this answer online, "Zero-order reactions are typically found when a material that is required for the reaction to proceed, such as a surface or a catalyst, is saturated by the reactants".

Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

### Re: initial concentration

Mathematically since you multiply k by the concentration of your reactant and the exponent is 0, this term doesn't affect the final answer.

Karina Jiayu Xu 4E
Posts: 58
Joined: Fri Sep 28, 2018 12:29 am

### Re: initial concentration

so is it okay to assume infinite concentration of initial reactants?