Background and Procedure: The chemical bromothymol blue is an indicator that appears blue in an alkaline (base) medium and yellow- green in an acid medium. CO2 has been added to the bromothymol blue. Carbon dioxide (CO2) in solution form- carbonic acid (H2CO3), turning the bromothymol yellow-green. If carbon dioxide is removed from the solution, the solution will change to dark green and then to blue. Bromothymol blue will stain your hands and clothing. Practice safe laboratory procedures when performing this activity. 1. With a permanent marker, write your initials (or group symbol) on both of the capped vials. 2. Obtain an 8-cm sprig of Chara and place it in one of the vials provided. 3. Over a paper towel, fill both vials to overflowing with the yellow-green bromothymol blue solution and tightly. Take care not to spill on your hands and thoroughly clean up any spills. 4. Place both vials in sunlight or strong light source. 5. Wait one hour, and then answer the questions for Activity 1.

Background and Procedure: The chemical bromothymol blue is an indicator that appears blue in an alkaline (base) medium and yellow- green in an acid medium. CO2 has been added to the bromothymol blue. Carbon dioxide (CO2) in solution form- carbonic acid (H2CO3), turning the bromothymol yellow-green. If carbon dioxide is removed from the solution, the solution will change to dark green and then to blue. Bromothymol blue will stain your hands and clothing. Practice safe laboratory procedures when performing this activity. 1. With a permanent marker, write your initials (or group symbol) on both of the capped vials. 2. Obtain an 8-cm sprig of Chara and place it in one of the vials provided. 3. Over a paper towel, fill both vials to overflowing with the yellow-green bromothymol blue solution and tightly. Take care not to spill on your hands and thoroughly clean up any spills. 4. Place both vials in sunlight or strong light source. 5. Wait one hour, and then answer the questions for Activity 1.

Principles Of Pharmacology Med Assist

6th Edition

ISBN:9781337512442

Author:RICE

Publisher:RICE

Chapter8: Forms Of Drugs And How They Act

Section: Chapter Questions

Problem 30RQ

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