If you need this or any other sample, we can send it to you via email. This could be due to systematic errors such as the reaction time of the student. Describe any sources of error in your experiment. What is your topic? Apparatus and Chemicals selection of syringes cm3 glass beakers white tile timer distilled water 1 mol dm? We’ll occasionally send you account related and promo emails.
Between every test, the starch used should be a fresh batch or to make sure to preserve the starch used for the experiment. There are also random errors such as the change of temperature. The graph on the trend line shows a linear correlation showing that the increase amount of volume of potassium iodide added to the mixture will increase the rate of reaction. As seen in the graph there is a positive correlation between the volume Concentration of the potassium iodide and the rate or reaction. Repeat steps 2 to 4 with each of the remaining solutions Note: Apparatus and Chemicals selection of syringes cm3 glass beakers white tile timer distilled water 1 mol dm? Place the beaker containing the mixture 1 on the white tile.
Plot a graph of rate against volume of potassium iodide. This result is backs up the collision theory1 that states in order to show a positive increase in the rate of reaction, the amount of collision must also increase.
In order to to exam;le to amount of collision, having more volume of potassium iodide increasing the concentration there is more chance of collision resulting in a faster rate of reaction. Starch- Indicator When starch is left in mixture for a long period of time, it starts to degrade and will take longer for the reaction to be seen affect the time taken. Haven’t found the Essay You Want?
A series of experiments will be carried out in which only the concentration of iodiine iodide ions will be varied. There is no possible way to change the speed of reaction as it is a human flaw, therefore using iovine more precise instrument will be more appropriate for the lab. Sorry, but downloading is forbidden on this website.
Give a valid conclusion to this experiment with an explanation. As seen in the graph, the line of best fit does not successful go through the first point 5,0.
Iodine Clock Reaction: Concentration Effect Essay
Stirring Swirling motion Keep constant of the stirring motion, by using a magnetic stirring rod when the potassium iodide is added so it does not affect the rate of reaction.
If there is too much of the concentration added to the mixture, the rate of reaction will be faster and if too little of the potassium iodide is added, it reacts at a slower place. A way to make the measurements more precise is to use the same error margins on all instruments thus allowing a constant error margin. Measurement Since it is not possible to eliminate the error margins of an instrument, it would be wiser to increase the precision of the instrument instead. The stirring motion was not kept constant and affects the time it takes for the potassium iodide to react with sodium thiosulphate as the rate of reaction would increase when the swirling motion is quick.
Iodine Clock Reaction: Concentration Effect Essay Example | Graduateway
Solutions Keep the temperature of the room constant by turning of the aircon before the lab starts, and checking the room temperature as the lab is being done 1 BBC GCSE Bitesize: Let us create the best courseworm for you! Sorry, but copying text is forbidden on this website.
Overall, these systematics and random errors do not influence the majority of the lab result as it continues to back up the collision theory and highlights the relationship between the rate of reaction and the concentration of the potassium iodide. As seen in the graph there is a positive correlation between the volume Concentration of the potassium iodide and the rate or reaction. During the lab, the temperature of the room increased resulting in a faster reaction changing the correlation between the rate of reaction and the volume usage.
Carefully swirl the reaction mixture in the beaker from time to time. We will write a custom essay sample on. Between every test, the starch used should be a fresh batch or to make sure to preserve the starch used for the experiment.
Add it to mixture 1 as quickly as possible and at the same coursewor start the timer. If you need this or any other sample, we can send it to you via email.
Describe ways of improving your experiment in order to reduce the errors you mentioned above.
Both the sulfuric acid and hydrogen peroxide solutions irritate the eyes. When using the syringes always keep them pointing downwards.
Place the beaker containing the mixture 1 on the white tile. The graph on the trend line foursework a linear correlation showing that the increase amount of volume of potassium iodide added to the mixture will increase the rate of reaction. There are also random errors such as the change of temperature.
As the iodine exmple are produced they immediately react with the thiosulfate ions and are converted back to iodide ions: If any chemical splashes on your skin, wash it off immediately.