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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: leUltraNoob1 on April 21, 2012, 04:13:56 PM

Title: What makes catalysts more effective than others?
Post by: leUltraNoob1 on April 21, 2012, 04:13:56 PM

For this reaction: http://en.wikipedia.org/wiki/Iodine_clock_reaction#Iodate_variation (http://en.wikipedia.org/wiki/Iodine_clock_reaction#Iodate_variation) using KIO3 for solution A and Na2S2O5 and H2SO4 for solution B.

With these catalysts added to solution B:  H2SO4, NaHSO4, CaCl2, CuSO4, HCl.

What makes some of them more or less effective?  

I observed this order of catalyst efficiency in speeding up the rate of the reaction: (fastest rate) H2SO4, HCl, NaHSO4, CuSO4, CaCl2 (slowest rate).  Does it have to do with H+?  Do these results make sense?

Title: Re: What makes catalysts more effective than others?
Post by: leUltraNoob1 on April 29, 2012, 02:15:51 PM

le ultra *Ignore me, I am impatient*

Title: Re: What makes catalysts more effective than others?
Post by: Arkcon on April 29, 2012, 02:43:40 PM

Quote from: leUltraNoob1 on April 21, 2012, 04:13:56 PM

I observed this order of catalyst efficiency in speeding up the rate of the reaction: (fastest rate) H2SO4, HCl, NaHSO4, CuSO4, CaCl2 (slowest rate).  Does it have to do with H+?  

This is a good guess.  Can you see why, from the reactions in the wikipedia article?