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ACIDS, BASES, & THEIR SOLUTIONS The pH Scale Is a substance an acid or a base?

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Presentation on theme: "ACIDS, BASES, & THEIR SOLUTIONS The pH Scale Is a substance an acid or a base?"— Presentation transcript:

1

2 ACIDS, BASES, & THEIR SOLUTIONS

3 The pH Scale Is a substance an acid or a base?

4 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

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

6 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.

7 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

8 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

9 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.

10 INDICATORS Litmus paper is an indicator  An acid turns blue litmus paper red  A base turns red litmus paper blue 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.

11 HOW DO WE MEASURE pH & WHAT IS pH?

12 pH= stands for powers of Hydrogen. ---It’s a measure of the hydronium ion concentration in a solution.

13 A CID B ASE NEUTRALNEUTRAL The pH Scale

14 A CID B ASE NEUTRALNEUTRAL The pH Scale

15 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.

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

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

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

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

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

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

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

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


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