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### A

Posted: Sun Mar 08, 2020 9:26 pm
is A the initial concentration or given concentrations when plugging them into equations? or is it not even concentrations?

### Re: A

Posted: Sun Mar 08, 2020 9:29 pm
A represents the reactant molar concentration. If its [a]0 then it's the initial concentration.

### Re: A

Posted: Sun Mar 08, 2020 9:37 pm
[A] is the concentration of the reactants and [A]0 is the initial concentration.

### Re: A

Posted: Sun Mar 08, 2020 9:51 pm
[A]0 represents the initial concentration and [A] represents the concentration of the reactants!

### Re: A

Posted: Sun Mar 08, 2020 9:55 pm
Also note if you were ever confused that A naught is how we refer to [A]0, and that the little 0 symbol, or naught, does often mean the initial or starting point when it is in the lower position (whereas it would usually mean under standard conditions if it were in the upper position).

### Re: A

Posted: Sun Mar 08, 2020 9:58 pm
In the Arrhenius equation, A does not represent concentrations. Instead, it is a reaction-based constant that describes the spatial requirements for the reaction to occur. If k is large, meaning that the reaction rate will be large, then A will also be large. A large A tells us that the spatial requirements for the reaction to occur are not demanding, whereas a small A tells us that they are.

### Re: A

Posted: Sun Mar 08, 2020 10:02 pm
A represents the concentration of the reactants and A0 represents the initial concentration.

### Re: A

Posted: Sun Mar 08, 2020 10:26 pm
Also, A varies by reaction but is mostly independent of temperature.

### Re: A

Posted: Sun Mar 08, 2020 10:26 pm
A is the concentration, while A0 is the initial concentration.