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 baseStrong acid = Weak base
Strong battery acid(sulphuric acid)
pH 0
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