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Neutralisation of Distilled Water.
Dilution of a sample with distilled water has a number of advantages.
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