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PH. Heartburn? Heartburn occurs when the acid from our stomach travels back up our oesophagus. It’s also known as Acid Reflux.

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Presentation on theme: "PH. Heartburn? Heartburn occurs when the acid from our stomach travels back up our oesophagus. It’s also known as Acid Reflux."— Presentation transcript:

1 PH

2 Heartburn? Heartburn occurs when the acid from our stomach travels back up our oesophagus. It’s also known as Acid Reflux

3 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

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

5 Strong battery acid (sulphuric acid)  pH 0

6 pH 1

7 pH 2

8 pH 3

9 pH 4

10 Black coffee pH 5

11 Urine pH 6

12 Distilled water pH 7

13 seawater pH 8

14 Baking soda pH 9

15 Milk of magnesia (Magensium hydroxide) pH 10

16 Ammonia solution pH 11

17 Soapy water pH 12

18 Oven cleaner pH 13

19 Drain cleaner pH 14

20 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

21 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

22 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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