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Questions concerning catalyst

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Hi everyone:D I am currently working on an IA report concerning the catalyst effect of Fe2+ on the reaction between persulphate ion and iodide ion:

2KI(aq) + K2S2O8(aq) -> 2K2SO4(aq) + I2(aq)

 

and i add Fe(II)SO4 as catalyst

 

My hypothesis is that as the concentration of the Fe(II)SO4 increases, the I2 formed should be increased as well. But as i just had my lab session today, i found that the below results :

 

If i don’t add any catalyst, the rate of I2 forming is super slow

If i add 5 ml of 0.1m Fe2+ catalyst, the frequency of blue adsorbent is at around 1.464 at 5 minute mark 

If i add 5 ml of 0.05m Fe2+ catalyst, the frequency of blue adsorbent is at around 3.000 at 5 minute mark and the color is much darker. 

 

I therefore would like to know if its possible that a catalyst has an optimum value? like if i add to much it would instead slow down the reaction? 

 

Thanks:D

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Yes catalysts often give max yield at a particular level / concentration. You should consider any possible side reactions, or if the mole of catalysts is too high to actually hinder collisions of your reactants.

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