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The pH Scale

This is a graded number system from 0 to 14 to give a measure of the level of acidity or basicity of a solution representing neutrality. Less than 7 is acidic and the lower the number the greater the acidity. Greater than 7 and the higher the number the greater the basicity.

Mandatory Practical Activity 13

Investigate the pH of a variety of materials using the pH scale.1. Obtain a variety of everyday solutions rainwater, milk, bleach, vinegar, fizzy drinks, fruit juices, tea, coffeof magnesia.2. Make up solutions of everyday soluble solids glucose, table salt, baking powder, bath salts.3. Put each solution into its own clearly labelled small test tube.4. Dip the end of a strip of Universal Indicator paper into the solution.5. Match the new or unchanged colour of the tip to a colour on the pH colour chart.6. The number on the matching colour on the chart is the pH of the solution.

7. Arrange in order of pH from 0 to 10 the substances that you tested.

The pH of a Variety of Common SubstancesSolution pHGastric Juice 2.0Lemon Juice 2.5Vinegar 3.3Orange Juice 4.4Rainwater 5.5Milk 6.5Pure Water 7.0Blood 7.4Saliva 7.8Seawater 8.3Toothpaste 9.0Milk of Magnesia 10.5

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