Experiment 13
OBJECT
To determine the pH value (varies between 6 and 9) of a given solution by buffer solution method.
APPARATUS
Test tubes, test tube holders, B.D.H. universal indicator etc.
THEORY
We know that indicators change their colours with change in pH value of the solution in which they are put. Consult the table given in the previous experiment to compare the colour with the colour chart provided there. The solution under examination is mixed with a suitable indicator and the colour that appears is compared with a series of mixture of buffer solutions of known pH and of the indicator selected already. The buffer solution which gives the identical colour as the test solution will have the same pH. For accurate pH determination, indicators ...
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