Name: Elise Rivera Partner: Rose Downey August 27th, 2015 and August 31st, 2015
Purpose: To experiment with changing the time of the reaction. We also got the chance to experience working with chemicals for the first time.
Procedure: Measure the temperature of the water. Make Vitamin C Solution using Vitamin C pills that are crushed and water. Make Solution A using the Vitamin C Solution, Iodine, and Water. Make Solution B using Water, Hydrogen Peroxide, and Liquid Starch. Make sure to measure the temperature of all the solutions. Then combine Solutions A and B and stir. Time this process until the mixture has changed colors.
Observations: Changing the temperature of Solution A and B helped decrease the time of stirring. Making more of Solution A helped decrease the time of stirring even more.
Conclusion: I thought it was fun getting to experiment with chemicals and see the different reactions. I also thought it was cool that making a small adjustment and make a positive change in the experiment overall.
Element: A substance used to make experiments. They are used in experiments to make something new.
Chemical reaction: When combining elements, you are making a chemical reaction.
Atom: It is apart of a chemical element.
Proton: Has a positive electric charge.
Neutron: Has a neutral electric charge.
Electron: Has a negative electric charge.
Hydrogen peroxide: H2O2
Water: H2O
Iodine: I2
Starch: C6H10O5
Vitamin C: C6H806
Here is the link for the spreadsheet I made that shows the time data portion of this lab:
In the second trial, my partner Rose and I decided to heat up Solution A and Solution B.
Solution A:
Before Microwaving: 21 °C
After Microwaving: 33.5 °C
Solution B:
Before Microwaving: 22 °C
After Microwaving: 31 °C
In the third trial, my partner Rose and I decided to add 1/5 more of each ingredient in Solution A. We chose this variable because it was a possible change and we were hoping that the more iodine, the quicker the reaction will happen. Turns out, not only did that happen, but it also turned a dark red color instead of a dark purple like before.
There wasn't a linear relationship from the three trials we did. There could've been, but we didn't do enough trials to tell. As the variables changed, the time decreased.
I believe that the more heat and product to work with, the quicker the reaction will happen. Our time never went up, so I can't pin point exact ways to slow down the reaction. Using common sense, I'm just going to say that if we made the product colder and made less of it that would probably slow down the reaction. I wouldn't know, but that's just a hypothesis.
After doing some research on the Iodine Clock Reaction Lab using this website:
I have found out what is happening. There are two forms of iodine being made. The two forms are, the elemental form and the ion form. While you are stirring the Vitamin C gets gradually used up. Once that happens, the iodine element and starch creates the color which is the reaction. According to the website, the product should become blue. I think that something else caused it to become two other colors. I'm not sure what that is, but for now I'm just going to believe this and try to look into it more.
I found out that more websites are saying that the product should be a dark blue/ blue. I'm still so confused.
Error Analysis: After doing the research, I asked Ms. Lyman and she said that dark purple is another color that can be shown for this lab. The thing is that something happened with the iodine causing it to turn a dark red/ the color of iodine. She said that we can find out next week.