Thursday, March 17, 2011

Conservation of Mass Lab Investigation

The combination of vinegar and baking soda will cause a very strong reaction. We did not need to shake up the solution in order for the reaction to occur. I researched the reaction between baking soda and vinegar. Baking soda is a pure chemical called sodium bicarbonate, which is the chemical formula of NaHCO3. Vinegar is a weak solution of acetic acid in water, approximately 5%. “The reaction between baking soda and vinegar is actually two reactions, an acid base reaction followed by a decomposition reaction. When the two ingredients are mixed, hydroge
n ions ( H+) from the vinegar react with the bicarbonate ions (HCO3- ) from the baking soda to form a new chemical called carbonic acid (H2CO3). The carbonic acid thus formed then immediately decomposes into carbon dioxide gas (CO2)and water (H2O). It's this carbon dioxide gas that can be seen bubbling and foaming as soon as you mix baking soda and vinegar together.”
Some of the observations I made were the Pop Rocks caused the soda to bubble, which caused the gas to be released. The balloon filled up a little, but it was not the reaction I was expecting. But once we shook the soda and Pop Rocks, the balloon started to fill fast. I also noticed that some of the Pop Rocks were sinking to the bottom, before the carbon dioxide was being released. It was mainly the larger chunks. For the vinegar and baking soda lab, there were bubbles forming in the liquid. The reaction started first away. There was no need to assist the “blowing up” of the balloon. A major difference from the different tests was the size of the balloon. Though we had to shake up the first one, the balloon was much larger than the one for the vinegar and baking soda.
A changing factor t
hat varied from lab table to table was the type of soda used. For my group, we used Coca Cola. After doing so research there are the amounts of carbonated water in the sodas we used today:

Sprite: 92.31%

Coke “Coca Cola”: 95.78%

Dr. Pepper: 96.17%
Because there are different levels, then the amount of carbon realized to create the gas, the ultimately lead to blowing up the balloon. The balloon was not filling up with gases, and thanks to Table 2, we discovered that if we shake the bottle gently, then the Pop Rocks will dissolve faster, which could realize the carbon dioxide. According to the manufactures of Pop Rocks, they contain sugar, lactose (milk sugar), corn syrup, and flavoring. All of the ingredients reach the boiling the point, and they are mixed with carbon dioxide gas under a 600 pound high pressure. I learned that the soda/Pop Rocks is actually not a chemical reaction, but a physical reaction. We had a few things wrong with our experiment. One of my group members accidentally brought in the wrong size empty bottle, only 16.9 FL oz. Some of the people in my group thought that it would be no big deal, but I said that the we needed to have the right size, because that could have been a huge difference. The balloons also there not the best quality. It was hard to put the Pop Rocks into the balloons. We there not able to put the whole package, like we there supposed to. I also tried to blow it up, it try to stretch out, so it could fit more inside, but it did not work. It also was difficult to stretch the balloon to fit it on the bottle opening, without spilling the Pop Rocks into the bottle. The balloons had a hard time filling up for the Pop Rock experiment.

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