[leUltraNoob1]

For this reaction: 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?

[leUltraNoob1]

le ultra *Ignore me, I am impatient*

[Arkcon]

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?