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)

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