Factors Affect Rate

Lab Report
SCH4U
Factors that Affect Rate
Dr. Cooper
Megan Lee
11-1-2015

Result:
Qualitative Observations:
  * During the performance of the experiment, it was noticed that the colour of H2O2 was colourless and the cataylsis potassium iodide was white.
  * When H2O2 was heated, it remained colourless.
  * While mixing the H2O2 with potassium iodide, the solution turned in yellow colour and certain amount of gas bubbles formed.
Quantitative Observations:
During the experiment, the mass of filter paper and the mass of filter paper and solid were calculated by direct measurement on an electronic balance.   The measured time of the experiment was constant at 90s.   The quantitative results of this experiment are listed in Table 1.
Table 1: The rate of reaction of this experiment of 5 trials:
Temperature(oC) | Starting Mass(g) | Final Mass(g) | Change of mass (g) | Rate of Reaction (g/s) |
1) 22±0.5 | 49.55±0.05 | 49.54±0.05 | 0.01±0.05 | 0.00011 |
2) 30±0.5 | 138.24±0.05 | 138.02±0.05 | 0.81±0.05 | 0.0024 |
3) 35±0.5 | 49.96±0.05 | 49.15±0.05 | 0.22±0.05 | 0.009 |
4) 45±0.5 | 150.84±0.05 | 150.11±0.05 | 0.73±0.05 | 0.0082 |
5) 50±0.5 | 142.68±0.05 | 141.64±0.05 | 1.04±0.05 | 0.0116 |
*Note: The uncertainties on the masses measured directly on the electronic balance are ± 0.05g due to the reading error on the balance.   The uncertainties of the temperature observed directly on the thermometer are 0.5°C due to the reading error on the thermometer.  

Graph of the rate of reaction of the experiment (Rate vs temperature):

Conclusion:
The independent variable of the experiment which is temperature had an impact on the rate of reaction.   As calculating the rate of reaction, found out that there is an error on the 35°C where the rate of reaction is higher than the rate of reaction of 45°C.   One potential source of systematic error in this experiment is did not zero the balance while measuring the mass on the electric balance.   In order to improve it, need to be...