Jessieee Posted March 27, 2005 Posted March 27, 2005 i have done an experiment using colourimeter to find the rate expression of the reaction between iodine and propanone. there were 3 sets of reaction mixtures 1. 4 cm3 of propanone, 2 cm3 of 0.05M iodine, 4 cm3 of 1M HCl, 4 cm3 of water 2. 2 cm3 of propanone, 2 cm3 of 0.05M iodine, 4 cm3 of 1M HCl, 6 cm3 of water 3. 4 cm3 of propanone, 2 cm3 of 0.05M iodine, 2 cm3 of 1M HCl, 6 cm3 of water i obtained 3 graphs of [i2] against time, and i found the slopes of them 1. -0.00647 2. -0.00367 3. -0.00375 what are the possible explanations for the slope of set 3 slightly greater than that of set 2?! is it only becoz there's some error when plotting the graph, or there are other reasons behind?! and also, i found that the initial temp of the 3 reaction mixtures being slightly different, why is it so? will this affect my result a litte? since temp affects the reaction rate.. thx alot!
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