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Presentation transcript:

pH

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

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

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

Strong battery acid (sulphuric acid)

pH 1

pH 2

pH 3

pH 4

Black coffee pH 5

Urine pH 6

Distilled water pH 7

seawater pH 8

Baking soda pH 9

Milk of magnesia (Magensium hydroxide) pH 10

Ammonia solution pH 11

Soapy water pH 12

Oven cleaner pH 13

Drain cleaner pH 14

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

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

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