FrosciSnowflake Posted March 14, 2016 Report Share Posted March 14, 2016 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 Reply Link to post Share on other sites More sharing options...
kw0573 Posted March 14, 2016 Report Share Posted March 14, 2016 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. Reply Link to post Share on other sites More sharing options...
FrosciSnowflake Posted March 18, 2016 Author Report Share Posted March 18, 2016 I tried yesterday and again it appears! Great i can write this in my report then Thank you so much:D Reply Link to post Share on other sites More sharing options...
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