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PH, Acids and Bases.

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Presentation on theme: "PH, Acids and Bases."— Presentation transcript:

1 pH, Acids and Bases

2 pH? What is that?? pH: a measure of the acidity or basicity of an aqueous solution The measure of hydrogen ions (these are positively charged)

3 Measuring pH A solution is “acidic” if the pH is less than 7
A solution is “basic” if the pH is more than 7

4 Measuring pH pH scale- measures how acidic, basic, or neutral a substance is Ranges from 0-14 pH of 7= neutral pH of less than 7= acidic pH of more than 7= basic

5 Basic

6 What does this have to do with water?
Pure water is neutral (pH=7) When chemicals are mixed with water, the mixture can be acidic or basic The pH of a sample of water determines its health and solubility

7 Acids Ex: vinegar and lemon juice High concentration of H ions
Become more acidic when added to water

8 Bases Ex: ammonia and baking soda Low concentration of H ions
Concentration of H ions is reduced when added to water

9 Lab activity Ammonia Distilled water Hydrochloric acid Lemon juice
Milk Rubbing alcohol Soda Sodium Hydroxide Vinegar

10 Common Items and their pH

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