Biology pH Homework - indicate a low pH and a high...

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Melissa Mathurin BSC 1010 pH Homework PURPOSE: The purpose of this experiment is to become familiar with the concept of the strength of acids and bases according to the pH scale. To do this, cabbage juice will be mixed with different household liquids and a color change will be produced. The pigment called flavin found in red cabbage will enable the color change to occur. Approximate pH of common household liquids will be identified through the various color changes observed PROCEDURE: 1. Chop up a head of red cabbage and put it in a bowl that can withstand heat. 2. Pour boiling water over the cabbage. 3. After 10 minutes, pour the mixture through a strainer into another container. 4. Dispose of excess cabbage. 5. Obtain coffee filter paper 6. Place a drop of the cabbage juice on the filter paper then a drop of the sample 7. Record data THEORY/PRINCIPLE: In chemistry, pH is a measure of the acidity or basicity of a solution. The strength of the pH scale is determined by the concentration of hydrogen ions(H+) where a high con cent ration of H+ ions
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Unformatted text preview: indicate a low pH and a high concentration of H+ ions indicate a high pH. DATA: Sample: Original Color: Final Color : pH State: Urine Pale Yellow Purple Neutral Saliva Clear Blue Purple Slightly Basic Lemon Juice Yellow Red Acidic Pickle Juice Yellow-Green Rose Acidic Rubbing Alcohol Clear Purple Neutral Milk White Rose Acidic Astringent Clear Blue Purple Slightly Basic Cranberry Juice Dark Pink Red Acidic Ammonia Clear Green Basic Shampoo Clear Purple Neutral Coca Cola Dark Brown Red Acidic Vinegar Clear Red Acidic Conclusion: In performing this experiment I understood the principles behind pH through experimentation with a cabbage juice indicator and certain household liquids. The household liquids differed in rankings on the pH scale in terms of acidity and basicity. According to the data obtained through the experiment Lemon Juice, Cranberry Juice, Vinegar, and Coca Cola were the most acidic substances found. Saliva and astringent were the most basic liquids tested....
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This note was uploaded on 10/25/2010 for the course BIOLOGY BSC1050 taught by Professor Ling during the Fall '10 term at Palm Beach Community College.

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Biology pH Homework - indicate a low pH and a high...

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