The color change of the bromothymol blue with water is caused by carbon dioxide from your breath. How can you test this hypothesis? Need answer immidiately.
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the expriment was fill half-a testube with water. then, add 5 drops of bromothymol blue. then, blow it until the color change. initial color was green. the color changed to yellow.now, The color change of the bromothymol blue with water is caused by carbon dioxide from your breath. How can you test this hypothesis?
One thing to try is the following:
Fill a tube with something that will absorb the CO2 in the breath (such as a straw partially filled with ascarite and partially filled with dehydriter (one to absorb CO2 the other other to absorb the water from the reaction--because the water produced in the reaction as well as the moisture in the breath will dissolve CO2). Blow through that straw and see if the indicator changes color. That won't prove conclusively that CO2 is the culprit but it will get you closer to know that.
Be sure the straw is large enough in diameter to hold enough ascarite and dehydrite to do the job; otherwise, you will use all of the reagents after which the straw will begin "leaking" water and CO2.
However, can I do the following: I pour some water in a test tube and apply a pH paper. Then, I blow in the water. If the color changes, then we can be sure that carbon dioxide can change alkalinity or acidity of water. Let me know what you think. I do not have chance to do the procedure described above but in critical thinking, would this be logical?
To test the hypothesis that the color change of bromothymol blue with water is caused by carbon dioxide from your breath, you can perform a simple experiment using the following materials and steps:
Materials:
1. Bromothymol blue solution
2. Two clear containers (cups or test tubes)
3. Drinking straw or another source of exhaled breath (e.g., balloon, syringe)
4. Water
Steps:
1. Prepare two identical containers (cups or test tubes) and label them as Control and Experimental.
2. Fill both containers halfway with water.
3. Add a few drops of bromothymol blue solution to each container. The color should be the same in both containers at this point.
4. Seal the containers to prevent evaporation.
5. Now, here comes the crucial step. The Control container will not be exposed to carbon dioxide, while the Experimental container will be exposed to your breath containing carbon dioxide.
6. Place a straw or another source of exhaled breath into the Experimental container and blow gently into it, ensuring that your breath bubbles through the solution. Do not blow into the Control container.
7. Observe any changes in color that occur in the Experimental container. Carbon dioxide should affect the color of the solution.
8. Compare the color changes (if any) between the Control and Experimental containers. If there is a distinct color change in the Experimental container but not in the Control container, it suggests that the color change is caused by carbon dioxide from your breath.
Remember, it is essential to maintain good scientific practice by repeating the experiment multiple times to ensure consistent results.