How Does Temperature Affects The Reaction Rate
After conducting the experiment and collecting results a final conclusion can be drawn. The hypothesis was supported by graph 3 and 6 which both showed that an increase in concentration of the reacting species resulted in an increase in reaction rate. Both graphs have a positive gradient which clearly indicates that concentration increases the reaction rate. The hypothesis also proposed that as temperature increases the speed of the reaction would decrease, this is evidenced in graph 7 which shows a negative decrease in time as the temperature of the solution increases. This decrease can be modelled by the exponential formula T=12.9e-0.0249t.
The raw data collected suggests that directly increasing the concentration of potassium iodate decreases …show more content…
This relationship can be seen in graph 7 where temperature is on the x axis because it was the independent variable of the reaction (Giangrandi, 2014). The graph shows an exponential equation of t=12.9e-0.0249T. Using this equation reaction speed of the iodine clock can be estimated based on temperature. However, the equation has an unknown asymptote where the reaction speed cannot be further decreased by increasing temperature. This provides a limitation to the model as time cannot be calculated when temperature is above the highest experimented value, …show more content…
A stopwatch was used to monitor how long the reaction took to complete. There are two areas for error by using a stopwatch, the first is human error of not being able to stop the timer as soon as the solution changes colour and the second is having to estimate when the solution has fully changed colour. A modification of this experiment could use a colour spectrophotometer to measure the exact point the solution changes colour. This would provide accurate results as the time would be recorded and the time would be stopped at the exact time in the reaction each time. Alternately, without the use of technology this error can be reduced by placing white paper under the beaker the reaction takes place in, and having the same person recording the time for each experiment. This would allow for better visibility of the reaction and reduce extra variables in the
The raw data collected suggests that directly increasing the concentration of potassium iodate decreases …show more content…
This relationship can be seen in graph 7 where temperature is on the x axis because it was the independent variable of the reaction (Giangrandi, 2014). The graph shows an exponential equation of t=12.9e-0.0249T. Using this equation reaction speed of the iodine clock can be estimated based on temperature. However, the equation has an unknown asymptote where the reaction speed cannot be further decreased by increasing temperature. This provides a limitation to the model as time cannot be calculated when temperature is above the highest experimented value, …show more content…
A stopwatch was used to monitor how long the reaction took to complete. There are two areas for error by using a stopwatch, the first is human error of not being able to stop the timer as soon as the solution changes colour and the second is having to estimate when the solution has fully changed colour. A modification of this experiment could use a colour spectrophotometer to measure the exact point the solution changes colour. This would provide accurate results as the time would be recorded and the time would be stopped at the exact time in the reaction each time. Alternately, without the use of technology this error can be reduced by placing white paper under the beaker the reaction takes place in, and having the same person recording the time for each experiment. This would allow for better visibility of the reaction and reduce extra variables in the