We got our quiz back today and I got a 100! After that we started our lab on acids,bases,pH,and indicators. In the lab we used red cabbage juice as an indicator to measure the pH of everyday things. Today we measured the pH of three liquids which were hand sanitizer, lemon soda, and apple juice. I thought it was really weird that Hand Sanitizer had a pH of 7 or neutral and that Lemon soda had a pH of 2 or really acidic. Apple juice had a pH of 3 which I had expected though. I thought it was really cool that cabbage juice is an indicator and not only that, but a very good indicator (Red cabbage juice can turn into six different colors depending on pH).
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| The 3 different solutions who's pH we tested. |
Tuesday or December 9, 2014 A.D.:
Today we finished our labs. This time we measured the pH of white vinegar, baking soda, shampoo, and conditioner. The white vinegar that we tested turned reddish pink when we poured the red cabbage juice, this means it has a pH of 3. The baking soda had a pH of 8 because the cabbage juice stayed blue. The shampoo had a pH of 5.5 because the cabbage turned purple. Finally, the conditioner had a pH of 8 because the color of the cabbage juice was still blue.
Wednesday or December 10, 2014 A.D.:
Today we used blue litmus paper and regular pH strips. Both of these strips are indicators of pH. The blue litmus paper can only tell if a substance is an acid or a base, but the regular pH strips can tell if a substance is acidic, basic or neutral. They can also tell which pH something has ranging from pH 1 to pH 12. To test the pH we put the strip into the solution we were testing and then waited a minute until the strip changed color. Using both of these indicators we tested the pH of 12 solutions. The 12 solutions were Mountain Dew which had a pH of 2, shampoo pH of 5, salt and sugar water pH 7, dish soap pH 8, vinegar pH 2, baking powder solution, Alka-seltzer pH 9, Ketchup pH 6, tap water pH 7, warhead solution pH 7, and Drain-O pH 11. Yes, we tested a lot today. It was fun!!! :)
Thursday or December 11, 2014 A.D.:
Today we finished up the questions of our lab that we did yesterday. I was very glad that we were able to do this in class because now I have to do less homework at home and have more free time. The questions included things like what the properties of bases and acids were and what happens when you drink Alka-selzer. (The Alka-selzer will react with the HCl in the stomach and will neutralize the acid. The product is always water and a salt with this type of reaction also called a neutralization reaction.)
Friday or December 12, 2014 A.D.:
Today we did two experiments of which only one actually worked. The first one was an experiment called Elephants toothpaste. In elephants toothpaste Hydrogen Peroxide breaks down very rapidly into water and O2. Normally it would take years to break down Hydrogen Peroxide, but we added a catalyst and that should make it break down. The problem was though that the H2O2 was already broken down partially. The link that comes next is a link to an experiment that worked. (They added soap for the bubbles and dye for the color.) https://www.youtube.com/watch?v=ezsur0L0L1c The next experiment worked. In the next experiment we combined Sulfuric acid with sugar. In the beginning nothing really happened, but after stirring a little the clear sulfuric acid turned darker and started bubbling. It then started to turn solid. Meanwhile, the black substance that was forming (Carbon from the sugar) started to move over the brim of the beaker. At the end the carbon was sticking about 20 centimeters over the cup and was completely solid.
Summary: This week was a great week because we got 5 full science classes. It was also great because we had two labs and a day full of experiments. One thing I would like to improve on for next week is doing my homework faster and more efficiently.
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