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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: yitzik on January 28, 2020, 03:06:59 PM

Title: PROBLEMS CALCULATING THE RATE LAW OF IODINE CLOCK
Post by: yitzik on January 28, 2020, 03:06:59 PM

HELLO!
i have done the famous experiment of the IODINE CLOCK and i'm trying to find out the reaction order but it seems that something wrong with the data.
time (s)   [S2O3] (liter)      ln(S2O8)   [S2O8] (liter)   ln(I-)    (liter)  [KI]
19       0.0004      -3.912023005   0.02          -2.525728644        0.08
58       0.0004      -3.912023005   0.02          -3.218875825        0.04
61           0.0004      -3.912023005   0.02      -3.912023005       0.02
30        0.0004      -3.506557897   0.03          -3.218875825           0.04
25       0.0004      -3.218875825   0.04      -3.218875825           0.04
119           0.0004      -4.605170186   0.01      -3.912023005           0.02

it seems that i have a mistake in some of the trials but idon't know which. using excel to plot the concentarion of each component vs ln rate dosnt give me an accurate result of the exponent of each specie.

how can i get on with thouse values?

thank you!

Title: Re: PROBLEMS CALCULATING THE RATE LAW OF IODINE CLOCK
Post by: yitzik on January 28, 2020, 03:09:05 PM

the main mistake is that the duration of the second and third trials is almost he same although there is a change in concentration.