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