[CHM 112] Concentration Lab

[Andrew Pounds]

On 07/13/2015 07:25 PM,  wrote:
>
> I'm having a little trouble finding the rate for the I- effect. In 
> order to find the rate, will I use [initial H2O2]-[initial I-]/ delta 
> t multiplied by -1/2 or just use [initial H2O2]-[initial I-]/ delta t? 
> I know stoichiometry comes into play somewhere when finding the rate 
> of reaction.
>

Whoa -- thats not how you do it.  Remember, we are ALWAYS following the 
rate of loss of peroxide.  That is the same for ALL of the experiments 
you did.  The rate of loss of peroxide is tied to the rate of loss of 
the thiosulfate ion via the reaction stoichiometry.   Remember -- for 
ALL the rates you divide the diluted thiosulfate ion concentration by 
two and then divide that value by the time.



-- 
Andrew J. Pounds, Ph.D.  (pounds at theochem.mercer.edu)
Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627

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