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PH. pH The strength of an acid or base is measured using a scale called pH. pH stands for ‘power of Hydrogen’  pH scale ranges from 0-14  Acids have.

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Presentation on theme: "PH. pH The strength of an acid or base is measured using a scale called pH. pH stands for ‘power of Hydrogen’  pH scale ranges from 0-14  Acids have."— Presentation transcript:

1 PH

2 pH The strength of an acid or base is measured using a scale called pH. pH stands for ‘power of Hydrogen’  pH scale ranges from 0-14  Acids have a pH less than 7  Bases have a pH higher than 7  Neutral pH is 7

3 Acids and Bases are actually related. Weak acid = Strong base Strong acid = Weak base

4 Weak & Strong pH Measures the concentration of H + available in water. The higher the concentration, the more acidic the solution is. The scale is exponential. pH 7 has a 1 to 1 ratio of H + : OH - pH 6 = 10x concentration of pH 7. pH 5 = 10x concentration of pH6. 1

5 pH Indicators pH indicators are chemical compounds which change colour depending on the concentration of H + Examples:  Litmus  Thymol blue  Phenolphthalene  Bromothymol blue  Methyl Orange

6 Why measure pH? We use pH indicators to measure a variety of things:  pH of Swimming pools  Waterways and environment  pH in the garden, soil.  Stomach conditions, skin, hair and mouth


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