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Acids & Bases

Acids & Bases. Our Goals. To determine the difference between Acids & Bases Discuss the importance of studying Acids & Bases Perform an experiment dealing with Acids & Bases. What is the pH scale?. The pH scale measures how acidic or basic a solution is. The pH scale.

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Acids & Bases

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  1. Acids & Bases

  2. Our Goals • To determine the difference between Acids & Bases • Discuss the importance of studying Acids & Bases • Perform an experiment dealing with Acids & Bases

  3. What is the pH scale? • The pH scale measures how acidic or basica solution is.

  4. The pH scale • The pH scale is the concentration of hydrogen ions in a given substance. • ION:an element with a charge due to a loss or gain of an electron

  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. Definitions of Acids and Bases • An acid is a substance that breaks into ions in an aqueous solution. • A Base (alkaline) is a substance that breaks into ions in an aqueous solution. • Note: aqueous solution is any solution where is the solvent.

  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. 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. Characteristics Of Acids Acids can be characterized by: • A sour taste. • It turns blue litmus paperred • It tastes sour. Try drinking lemon juice (citric acid)

  10. Characteristics of Bases A Base is characterized by: • A bitter taste. (Milk of Magnesia) • It feels slippery. (Soapy Water) • It turns Red LitmusBlue.

  11. Phenolphalein Demo • http://studyjams.scholastic.com/studyjams/jams/science/matter/acids-and-bases.htm

  12. Why Learn about Acids & Bases? • What do you think is the pH level of FairLawn tap water? • The pH of a swimming pool must be checked periodically. Why? • Is it important for Lakes & Rivers to maintain a certain pH?

  13. Today’s Experiment • Test the pH of Citrus fruit, shampoo, milk of magnesia, tap water, soap and dissolved salt. • GOOD LUCK!!!

  14. Experiment color of litmus paper acid or base • Pepsi: • Tap water: • Drain Cleaner:

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