Rationale
The big issue is that I want to see if chemical reactions will happen faster if they happen at different temperatures. So, I will see if iodine solution and starch solution will react faster if they are at room temperature, at 40 degrees and if they are cold. So, I will be recreating the Iodine Test
Background Research: The Iodine test is an experiment which is used to determine the existence of starch. When this chemical reaction occurs the starch changes colour from a clear liquid to blue/black colour, in addition that it is an aqueous solution of the triiodide anion, due to the structure of an intermolecular charge complex. When the starch is not present, the brown colour of the solution stays. The chemical reaction between starch and iodine is also the origin of iodometry. Iodine solution is best known as Lugol’s iodine, which is known as aqueous iodine and it is a strong solution and the solution of potassium iodide with iodine in water. It is also known as a medication and a disinfectant worldwide and it it used for many things. Starch is a polysaccharide involving two different kinds of molecules: amylose and amylopectin. Amylose is a very important component because it is liable for the structure of blue/black colour in attendance of iodine
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Aim
My aim is to see whether an iodine solution and a starch solution will react faster if the temperature is changed for both chemicals so I will be testing them at room temperature, a cold temperature and a hot temperature of my choice, then I will hopefully figure out whether they react faster in room, hot or cold temperature better.
Hypothesis
My hypothesis is that the iodine solution and the starch solution will react faster when they are both heated up to 40 degrees Celsius, then combined. I also think that when they are both cold and placed together it ill take a longer amount of time to react and turn into the aqueous solution of blue/black colour.
Method
- Gather all the necessary equipment needed that is listed in the materials part of scientific report. Don’t forget to wear your safety glasses [image: cid:963d7006-7ad9-4a76-a03f-c50a455e6b63@ausprd01.prod.outlook.com]
- First you want to grab 2 test tubes and you are going to want to fill one with the iodine solution and the other with the starch solution and place it in the test tube rack. We are also wanting to fill both test tubes to halfway.
- Then you are going to do the same step as step 2 but then you must place some ice in a beaker and then place both test tubes in the beaker filled with ice so that we can have a cold temperature solution of starch and iodine
- Then you are going to do the same step as seen in step 2 but now you must put hot water in the second beaker and place both test tubes that are carrying the starch and iodine solution in the beaker full of water, then you will place the beaker on the gauze mat that is on top of the tripod.
- Now you must place the Bunsen burner under the tripod and now you must turn it on. So, grab a match and make sure you twist the part at the bottom of the Bunsen burner and make sure the holes are open, and once you have done that you can now turn on the Bunsen burner so turn on the gas and light the match and hold it over the top of the Bunsen burner and it will turn on. Once you have turned it on leave it on the orange flame
- Now wait about 10 minutes and once ten minutes has gone by grab the thermometer and place it in the beaker full of water that it on the gauze mat and make sure it doesn’t exceed 40 degrees Celsius and once it has reach 40 degrees Celsius you can now finishes the experiment and mix both solutions together to see if temperature effects the rate of reaction
- Now create a result table and right down your results and in the table make sure you have results for 40 degree iodine solution and starch solution, then for when the two solutions are cold and room temperature for both the two solutions and right down the times or the rate of the reaction. Once you have done that draw a Line Graph for the results you have collected from your experiment.
Discussion
In my experiment there were some trends and some relationships. One of the major trends is that at room temperature the time was very similar giving me an almost straight line, in my line graph showing my results. I could see throughout my results that 10 degrees Celsius and room temperature had a similar trend to each other’s results showing that there wasn’t much time apart from each other. My answer relates to my question because I wanted to see whether temperature can affect the rate of reaction or not, and in my hypothesis I said that when the Iodine and starch solution is heated to 40 degrees Celsius it will be a fast reaction but when they are both placed in ice and at a temperature of 10 degrees Celsius it will take a longer time, my hypothesis was right. I say my hypothesis is right because in my results you can see that the 40 degrees trials were very fast whereas the 10 degrees trials took longer to react with each other.
Evaluation
The strengths in my investigation is that my hypothesis is true because the way my results look, which they are showing that temperature affects the rate of reaction. What also helped me carry out my experiment is that all test tubes were measured accurately, so that caused me to get reasonable results. But what didn’t help me get reliable results is that sometimes when I was heating or cooling the iodine and starch solution down, the temperature would go past 40 degrees Celsius and would go below 10 degrees Celsius, which caused me to get reasonable result but not fully reliable results with some tests. Some errors that occurred throughout my experiment is that I heated up the beaker to much and it caused the beaker to go black at the bottom. My investigation was valid because the outcome proves that my hypothesis is true, that temperature can affect the rate of reaction. I changed my independent variable very well because I did the reaction using different temperatures of those two chemicals. I measure my dependent variables very well by using a measuring cylinder to get an accurate amount of the chemicals I was using. I did well with the constant variables because I kept each trial at one specific temperature.
Concluding Statements
In conclusion the trends in my results show that when both iodine and starch are at 40 degrees Celsius the rate of reaction was faster, which resulted in a quicker time then to when both the iodine and starch solution were at 10 degrees Celsius because when they were both 10 degrees Celsius it took a longer for the reaction to happen. The validity of my question and hypothesis is reliable because my hypothesis is right that temperature can either speed up a reaction or slow it down, and this helps make my question reliable because my question was Does Temperature Affect The Rate Of Reaction. I think my question wasn’t specific enough because I only tested whether temperature can affect the rate of reaction, but I only tested it with two chemicals which Iodine solution and starch solution were. This means that not every reaction might not be affected by temperature and its rate of reaction due to the chemicals being used. My findings have expanded my knowledge, on the topic of does temperature affect the rate of the reaction, because my experiment shows me that when the chemicals that are being used, are either heated or cooled down then tested in a reaction, that it can affect the amount of time it takes for the reaction to occur. My findings could inform future research because, if someone was to complete an experiment and if they collected there results for their experiment and if they were to research about the chemicals and equipment they used for the experiment and if they were to see other individuals results and they were different, that could be due to the temperature of the chemicals being used and the type of environment there in.
Bibliography
- Listed, N. (2019, May 18). Iodine Test. Retrieved from Wikipedia : https://en.wikipedia.org/wiki/Iodine_test
- Listed, N. (2019, May 21). Penrith Anglican College Risk Assess Risk Assessment. Retrieved from Penrith Anglican college.
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