Lab Report_ Acid and Base Investigation

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Brooklyn College, CUNY *

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2050

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Chemistry

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Feb 20, 2024

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pdf

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2

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Lab Report: Acid and Base Investigation Hypothesis: (5 pts) Hypothesize whether you think each of the following substances will be an acid, a base, or neutral: Bleach: Base Detergent: Base Eye drops: neutral Lemon juice: acid Tea: acid Procedure: ● Select a product from the stock shelf and transfer the liquid to a test tube. ● Select a paper pH test strip. Record the color of the test strip in the data chart. Transfer it to the same test tube. ● Note any color change of the paper and record in the data chart. ● Drag the test tube containing the test strip over to the color chart to determine the pH range indicated by the paper. Record your results. ● Record your conclusion about whether the substance is an acid, a base, or a neutral substance. ● Repeat for all substances. Data chart: (5 pts) Initial color of solution Final color of solution pH range on test strip Acid/Base/Neutral Bleach Light yellow Bright yellow >12 Base Detergent Lime green Cyan 8-10 Neutral/weak base
Eye drops Light blue Dark blue 7 Neutral Lemon juice Yellow Red 1-3 Acid Tea Brown Purple 4-6 Weak acid Conclusion: (20 pts) 1. Place the five substances in order of increasing pH—from most acidic to most basic. (2 points) - Lemon juice, tea, eye drops, detergent, bleach 2. Orange juice has a pH of 4. What color would you expect the paper test strip to be after it is dipped in a sample of orange juice? (2 points) - Purple 3. Determining the pH of substances such as purple grape juice and catsup using test strips can be difficult. Why? (3 points) - Determining the pH of these substances may be hard due to their dark and opaque color, thus they might naturally affect the color of the pH strip. 4. Tear–free shampoos are advertized as having a pH similar to that of human tears. What pH would you expect tear–free shampoos to be? Use evidence from the lab activity to support your response. (5 points) - I would expect tear-free shampoos to have a pH of around 7. Within the lab, the eye drops result to have a pH of 7 and it is said eye drops should have a similar pH as human tears. Thus, if tear-free shampoos have a similar pH to human tears they should also have a similar pH to eye drops. 5. What is the approximate hydronium ion concentration and hydroxide ion concentration in a cup of tea? Which is higher? (Refer back to the chart of pH if you need to.) (4 points) - The approximate hydronium ion concentration of tea is 1x10^-4-1x10^-6. The approximate hydroxide ion concentration of tea is 1x10^-10-1x10^-8. Therefore, the hydronium ion concentration is higher. 6. What is the approximate hydronium ion concentration and hydroxide ion concentration in bleach? Which is higher? (4 points) - The approximate hydronium ion concentration of bleach is 1x10^-13-1x10^-14. The approximate hydroxide ion concentration of bleach is 1x10^-1-1x10^-0. Therefore, the hydroxide ion concentration is higher.
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