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What are Acids and Bases?

What are Acids and Bases?. Acids and Bases. 2. Some of our favorite foods make our tongue curl up because they are SOUR. Bitter!. 3. Some foods have a “bite” of their own because they’re somewhat bitter. WHY?. Acidic/Basic. 4. There is a scientific reason for this:

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What are Acids and Bases?

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  1. What are Acids and Bases?

  2. Acids and Bases 2 • Some of our favorite foods make our tongue curl up because they are SOUR.

  3. Bitter! 3 • Some foods have a “bite” of their own because they’re somewhat bitter. • WHY?

  4. Acidic/Basic 4 • There is a scientific reason for this: • These foods are either acidic or basic. • Other substances besides foods have these characteristics.

  5. Acids and Bases 5 • Chemicals may be classed as acids or bases. • Things that are neither acids nor bases are neutral. • pH measures how acidic or basic a solution is.

  6. On page of your Interactive Notebook • Title the page “Acids and Bases” • You will be taking notes on acids and bases.

  7. Acids 7 • Often taste sour * • Strong acids can burn skin & eyes • Strong acids can dissolve metals • Turns blue litmus paper to red *Never test an unknown acid by tasting it!

  8. Bases 7 • Can taste bitter, sweetish, or salty * • Often feel slippery or “soapy” * • Strong bases can burn skin & eyes • Turns red litmus paper to blue • Bases react more easily with protein than with metal; they are often used for cleaning *Never test an unknown base by touching or tasting it!

  9. 9 No I am Not: • Some substances are not really an acid or a base: For example, pure water

  10. Most Substances: 10 • Can be identified as either acidic or basic • Like the soil in our backyard.

  11. We use indicators to identify acids and bases. • An indicator is a substance that changes color in the presence of an acid or a base.

  12. pH • The pH of a solution tells us how strong an acid or a base the solution is. • The lower the pH, the stronger the acid.. The higher the pH, the stronger the base.

  13. pH Scale 13 0--------------7---------------14 Acid Neutral Base pH < 7 are acids pH > 7 are bases pH = 7 is neutral

  14. Therefore… 14 • If the number is less than 7 the solution or water is acidic • If the number is more than 7 the solution or water is basic

  15. The pH Scale 15 • pH scale ranges from 0 -14 • pH 7 is neutral; neither acid nor base • Pure water is pH 7 • Low pH = acid • High pH = base • The closer to the ends of the scale, the stronger the solution is

  16. Why is pH important? 16 Fish can’t live if the pH is too high or too low Soil has to be in a certain pH range for plants to grow and stay healthy.

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