Acids & bases

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Acids & bases

  1. 1. Acids & Bases By Robert McGee
  2. 2. Our Goals for today • To determine the difference between Acids & Bases • Discuss the importance of studying Acids & Bases • Perform an experiment dealing with Acids & Bases
  3. 3. What is the pH scale? • The pH scale measures how acidic or basic a solution is.
  4. 4. The pH scale • The pH scale is the concentration of hydrogen ions in a given substance. [ ] pH = − log H +
  5. 5. Identifying Acids and Bases • Acids have a ph from 0-7 • Lower pH value indicates a stronger acid. • Bases have a pH from 7-14 • Higher pH value indicates a stronger base.
  6. 6. [OH ] − Definitions of Acids and Bases • An acid is a substance that breaks + into [ H ] ions in an aqueous solution. • A Base (alkaline) is a substance that breaks into [OH − ] ions in an aqueous solution. • Note: aqueous solution is any solution where H 2 O is the solvent.
  7. 7. Did we Miss something?? • What happens when the pH of a substance is 7? • Ans: A pH level of 7 indicates a Neutral Substance i.e: Water!
  8. 8. Test Your Knowledge • What is the range of an ACID on the pH scale? Ans: 0-7 • What is the range of a BASE and what is another name for a BASE? Ans: 7-14, Alkaline
  9. 9. Characteristics Of Acids Acids can be characterized by: 1. A sour taste. 2. It turns blue litmus paper red 3. It tastes sour. Try drinking lemon juice (citric acid)
  10. 10. Characteristics of Bases A Base is characterized by: 1. A bitter taste. (Milk of Magnesia) 2. It feels slippery. (Soapy Water) 3. It turns Red Litmus Blue.
  11. 11. Why Learn about Acids & Bases? • What do you think is the pH level of tap water? • The pH of a swimming pool must be checked periodically. Why? • Is it important for Lakes & Rivers to maintain a certain pH?
  12. 12. Today’s Experiment • Test the pH of Pepsi, tap water, and drain cleaner • GOOD LUCK!!!

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