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Vinegar pH and CO(2) Production in the Reaction with Baking Soda

CSEF · 2003 Chemistry

Patrick L. Selsted · Turtle Rock Elementary School, Irvine

Overview

Objectives/Goals My question was "how does the pH of different types of vinegar affect the amount of CO(2)produced when mixed with a fixed amount of baking soda." My hypothesis was that the amount of CO(2) produced would be directly related to the pH of the vinegar. Methods/Materials Materials: 1. baking soda 3. pH meter 9. plastic tube 15. pipettes 2. vinegar 4. electronic balance 10. 1-hole stopper 16. pipettor white 5. weighing boats 11. rubber sleeve apple 6. side arm flask 12. long balloons balsamic 7. Petri dish 13. 400 ml beaker rice 8. rubber bulb 14. 500 ml cylinder Methods: 1. Measure and record the pH of each type of vinegar. 2. Mix 2 grams of baking soda in the sidearm flask with 8 ml of each type of vinegar. 3. The CO(2) that was produced was collected in a balloon. 4. The chemical reaction was allowed to continue for 3 minutes and the balloon was tied. 5. The balloon was submerged in a water-filled beaker, and the amount of water displaced was measured with a graduated cylinder. 6. This procedure was repeated three tines for each of the four vinegars. Results The pH's of the four vinegars franged from 2.55 to 3.18: white (2.55), rice (2.72), balsamic (3.05), apple (3.18), but there was no correlation between the pH of the vinegar and the amount of CO(2) produced. Conclusions/Discussion The acidity as measured by pH was not related to the amount of CO(2) produced. Therefore, my hypothesis, that the amount of carbon dioxide released would be directly related to the pH, proved to be wrong.

Summary statement

I tried to show that the pH of different vinegars would predict how much carbon dioxide would be generated when reacted with baking soda.

Help received

My father helped me set up the side arm flask and he showed me how to use the pH meter and the balance. This was done in my father's microbiology lab at UC Irvine.

Awards (1)

  • Category Award

Competition history

  • CSEF 2003 Chemistry · Entry J0530

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