experiment 15 - 2/s Sources of error may have come from...

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In part 1 of this lab the effect of concentration on reaction rates were measured using three different solutions of KI, water, and H 2 O 2 at different concentrations. This was done by using a device that measured the volume of O 2 produced and a stop watch. It was found that the rates effectively increased as the concentrations were changed from solution 1 to solution 2 to solution 3. The general formula for this part was 2H 2 O 2 -> 2H 2 O + O 2 . Sources of error for this part may have come from the water levels not being equalized which may have given wrong measurements of O 2 produced. In part 2 of this lab the effect of temperature on reaction rate was determined using essentially the same procedure as part 1. The solution 1 from part 1 was remade and heated to 35-40 degrees C. Then the amount of O 2 produced was measured at intervals and the time recorded. It was found that changing the temperature by a positive 16 degrees lead to an almost doubling of the rate, from .0256 to .0586 ml O
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Unformatted text preview: 2 /s. Sources of error may have come from water levels not being equalized. 2H 2 O 2 -> 2H 2 O + O 2 was the equation used. In part 3 of this lab the molar concentration of hydrogen peroxide was determined. This was done by using the same procedure as part 1 and then using the barometric pressure and the ideal gas equation PV=nRT to determine the moles of O 2 and H 2 O 2. This was found to be 7.53e-4 mol and 3.76e-4 respectively. Using this the molar concentration of H 2 O 2 was found to be .0752M. Sources of error could have been from water levels not being equalized properly. In part 4 of this lab the catalyst was recovered by titrating the completed reaction solution from part 3 with AgNO 3. K 2 CrO 4 was used as the indicator. Ag+ + I- -> AgI was the equation utilized in this part. Sources of error may have come from the reaction not have gone to completion in part 3 of the lab....
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This note was uploaded on 03/14/2010 for the course CHEM 109A 109A taught by Professor Aue during the Spring '09 term at UCSB.

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experiment 15 - 2/s Sources of error may have come from...

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