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pH Scale and Buffers: Balancing Acids and Bases

Dive into the world of acids, bases, and buffers! Learn about the pH scale, characteristics of acids and bases, buffer solutions, and their importance in maintaining balance. Conduct an engaging experiment to understand their interactions.

mohammad-jennings
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pH Scale and Buffers: Balancing Acids and Bases

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  1. Acids, Bases and Buffers OH MY!!

  2. Acids, Bases and pH One water molecule is made of two ions, (H+) and a Hydroxide Ion (OH-) Hydrogen Ion Hydroxide Ion Acid Base H2O  H+ + OH-

  3. Acids and Bases • Acid: A solution with lots ofH+ ions • pH0 up to 7 is acid (acidic) • Base:A solution with lots of OH- ions • pHabove 7 – 14 is basic (alkaline)

  4. The pH Scale…acids • Indicates the percent of H+ ions • Ranges from 0 – 14 • pH of 7 is neutral • Each pH unit represents a factor of 10X change in concentration • pH 3 is 10 x 10 x 10 (1000x) stronger than a pH of 6

  5. The pH Scale…bases

  6. Buffers • Weak acids or bases that react with strong acids or bases to prevent sharp, sudden changes in pH (neutralization). • Produced naturally by the bodyto maintainhomeostasis Weak Acid Weak Base

  7. Procedure:Wear Goggles at all times! • Add 50 mL of cabbage juice indicator • Half teaspoon baking soda to one beaker—label “Buffer” • Label other beaker “Control.” • Half teaspoon of Sprite to “Buffer” beaker. Stir. • Continue adding Sprite until “Buffer” matches other beaker color. 5. Add 2 drops of vinegar to “Control” beaker-swirl. 6. Repeat with “Buffer.” 7. Alternate adding vinegar. 8. Observe color reactions and record amounts of vinegar.

  8. After Clean Up! • Answer questions in #10. • Add the following after reading the info on the reverse side: • What is alkalosis? • What could lead to alkalosis in the body? • What is acidosis? • What could lead to acidosis in the body?

  9. Ticket out the Door Draw a water molecule with labeled atoms and charges. What is the property called that describes water sticking to itself? What makes a solution acidic? What has a higher pH, bleach or lemon juice?

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