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Neutralisation of Distilled Water.

Dilution of a sample with distilled water has a number of advantages.

Procedure

1. - Pour approximately 100 ml of distilled/deionised water (H₂O) into a 250 ml beaker or conical flask (use a conical flask if not using a magnetic stirrer), and add a few drops of phenolphthalein indicator.

2. - Adjust (titrate) the distilled H₂O until a pink colour end point is achieved that persists.

The water is now considered neutral for titration purposes.

Note: you do not need to record the amount (titre) of 0.1 M NaOH used.

Note: even distilled/deionise water can be slightly acidic due to the presence of carbon dioxide (CO₂ ).

Any acidity present will be indicated by the initial abscence of pink colouration, and will require neutralization by the above method

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