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ACIDS, BASES, & THEIR SOLUTIONS

ACIDS, BASES, & THEIR SOLUTIONS. The pH Scale. Is a substance an acid or a base?. ACIDS. a compound that increases the number of hydrogen ions (H+) when dissolved in water tastes sour An acid can change the color of certain compounds. What is an ion?.

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ACIDS, BASES, & THEIR SOLUTIONS

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  1. ACIDS, BASES, & THEIR SOLUTIONS

  2. The pH Scale Is a substance an acid or a base?

  3. ACIDS • a compound that increases the number of hydrogen ions (H+) when dissolved in water • tastes sour • An acid can change the color of certain compounds

  4. What is an ion? An ion is an atom that has lost or gained an electron giving it a positive (+) or negative (-) charge.

  5. USES OF ACIDS • Citric & ascorbic acid (Vitamin C) = orange juice • Carbonic & phosphoric acid give a “bite” to soft drinks • Acids in your stomach aid in digestion • Sulfuric acid is the most widely used industrial acid in the world. It’s used in making metals, paper, paints, and fertilizers.

  6. BASES • any compound that increases the number of hydroxide ions (OH-) when mixed with water • tastes bitter • feel slippery • A base can change the color of certain compounds

  7. Uses of Bases • used in soaps (remember, bases are slippery) • used to make paper, in oven cleaners, and to unclog drains • Ammonia is a base and is used in many household cleaners

  8. Detecting Acids and Bases • You can detect an acid or a base using an indicator. • INDICATOR- A substance that changes color in the presence of an acid or a base.

  9. INDICATORS • Litmus paper is an indicator • An acid turns blue litmus paper red • A base turns red litmus paperblue • Cabbage juice can be used as an indicator. • pH paper- turns a color & then match it to the pH scale given. • pH meter- will give you a number for the solution.

  10. HOW DO WE MEASURE pH & WHAT IS pH?

  11. pH= stands for powers of Hydrogen.---It’s a measure of thehydronium ion concentration in a solution.

  12. NEUTRAL ACID BASE 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 The pH Scale

  13. NEUTRAL ACID BASE 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 The pH Scale

  14. Let’s see what you’ve learned! • Mrs. Borras wants to know what you’ve learned. Answer the following questions carefully. • DO NOT ANSWER OUT LOUD!!!!! Write it down.

  15. Question #1 • Lemon juice has a pH of 2.2. Is it an acid or a base?

  16. Question #2 • Detergents such as Tide have a pH of about 10. Is Tide an acid or a base?

  17. Question #3 • Seawater has a pH of 8.2. Is seawater an acid or a base?

  18. Question #4 • The inside of your mouth has a pH of 7. Is it an acid or a base?

  19. Question #5 • How do you think we came up with the term “acid rain”?

  20. Question #6 • 409 cleaner contains ammonia that has a pH of 12. What will 409 do to red litmus paper?

  21. Question #7 • A soft drink has a pH of 3.2. What will it do to a piece of red litmus paper?

  22. You’ve just completed Mrs. Borras’ Quiz Let’s see how you did!

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