2. Science Research Log for What Combination of Vinegar and Baking Soda Produces the Most Carbon Dioxide? By Mrs. Schneggenburger and Mrs.Joko’s 2008-2009 Science Classes Chemistry Experiment Grade 6 - Canyon View Elementary November 24, 2008

3. Table of Contents Problem Slide 3 Research Slide 4 Hypothesis Slide 5 Materials Slide 6 Experimental Procedure Slide 7 Variable/Controls Slide 8 Data Slide 9 Analysis Slide 10 Conclusion Slide 11 Bibliography Slide 12

4. Problem What ratio of vinegar and baking soda produces the most carbon dioxide, 1:2, 1:1, or 2:1?

5. Research Use the books, experts, or the internet. You must have at least 3 sources and write at least a half page on each. Source #1 Source #1: http://library.thinkquest.org/3347/vinegar+bsoda4.htmlhttp://library.thinkquest.org/3347/vinegar+bsoda4.html When baking soda and vinegar combine, there are actually two reactions taking place. The acetic acid in vinegar reacts with sodium bicarbonate to make carbonic acid. This is unstable and quickly reacts with the water to produce carbon dioxide. (This would continue for a half page!) Source #2 : Source #2 : http://kitchensavvy.typepad.com/journal/2005/01/baking_soda_vs_.htmlhttp://kitchensavvy.typepad.com/journal/2005/01/baking_soda_vs_.html Baking soda and baking powder are both chemical leaveners that make cakes rise. The main difference is that baking powder contains an acid and a base, while baking soda contains only a base. In order for baking soda to create the carbon dioxide bubbles to make cakes rise, it needs an acid like vinegar to be present. (This would continue for a half page!) Source #3: Albertson’s 100% Pure Baking Soda Source #3: Albertson’s 100% Pure Baking Soda Baking soda can be used as a cleanser, and it does not scratch. It is also used for absorbing unpleasant odors in places like the refrigerator or the carpet. Baking soda is probably best known for its use in baking cakes and cookies. It helps make things rise because it produces carbon dioxide gas when combined with an acid. If you have indigestion, baking soda can help neutralize your stomach acids. ( This would continue a half page!)

6. Hypothesis If then becauseIf vinegar and baking soda are combined in 1:2, 1:1, and 2:1 ratios and the amount of carbon dioxide gas released for each ratio is measured, then the 2:1 ratio will produce the most bubbles because there is acid in vinegar, and it is very powerful.

7. Materials 3 cups Baking soda Vinegar Measuring spoons Test Tubes Centimeter Rulers Vis a Vis Pens

8. Experimental Procedure 1.Using the test tubes, fill each as follows: A. 1:2 ratio - 2 tsp vinegar: 4 tsp baking soda B. 1:1 ratio - 3 tsp vinegar: 3 tsp baking soda C. 2:1 ratio - 4 tsp vinegar; 2 tsp baking soda 2.Using a centimeter ruler, measure how high the bubbles reach in each test tube. 3.Record the measurements for each tube to your data table. 4. Repeat steps 1-3 two more times (three in all)

9. Variable/Controls Variable Variable : The ratio of vinegar to baking soda Controls Controls: Test tubes, temperature, baking soda, vinegar, measurers

10. Data Ratio of Vinegar to Baking Soda Test #1Test #2Test #3 Average 1:25 cm5.5 cm 5.3 cm 1:15 cm5.5 cm 5.3 cm 2:15 cm5.5 cm6 cm5.5 cm

11. Analysis The 2:1 ratio had a slightly higher average of carbon dioxide bubbles.

12. Conclusion Our experiment proved that our hypothesis was correct. The ratio containing a larger amount of vinegar produced a slightly larger amount of carbon dioxide bubbles than the ratio containing equal amounts or more baking soda. However, the increase in carbon dioxide was very small. To truly increase the amount of carbon dioxide, it would probably take an increase in both components because it is their combination that produces the gas. This experiment could be useful in a variety of ways. If you wanted to make a cake rise, you would be sure to have an acidic ingredient to go along with the baking soda. Baking powder works because it contains both baking soda and an acid in the can. Knowing the best ratio would be helpful in making recipes. If you wanted to neutralize stomach acid, you probably wouldn’t want to make so many bubbles, so you would want the ratio that produces the least amount of bubbles.

13. Bibliography Albertson’s 100% Baking Soda. Distributed by Albertsons, Inc., Boise, Idaho. Kitchen Savvy, “Baking Soda vs. Baking Powder”. Retrieved from http://kitchensavvy.typepad.com/journal/2005/01/baking_soda_vs_. html on December 12, 2007. http://kitchensavvy.typepad.com/journal/2005/01/baking_soda_vs_. html “Vinegar + Baking Soda Explanation.” Retrieved from http://library.thinkquest.org/3347/vinegar+bsoda4.html on December 12, 2007. http://library.thinkquest.org/3347/vinegar+bsoda4.html