Unit 4 Lesson 17

Acids and Bases

• Are corrosive and toxic
• Classified according to their observable behavior
• Change the color of indicators
• Water is not acidic or basic so it's neutral

Indicator- a molecular substance that changes color when it comes into contact with an acid or a base
The pH scale

The colors on the pH scale are associated with a "universal indicator" and every color has a specific number known as the pH.
Numbers on the left leading up to 7 are pHs relating to acids, 7 is neutral like water, and the numbers on the right after 7 refer to bases.
The further away from 7 on either side the potentially more toxic the acid or base would be.

Practice Problems
2. The pH scale is a number line that assigns numbers from 0-14 to acids or bases
5. a) acid b) base c) base d) neutral e) base

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