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Experiment to obtain curves which show how the pH changes during an acid-base titration and;To use these curves to choose suitable indicators for different combinations of acid and alkali.
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Experiment 15 23-3-99 Aim: * To obtain curves which show how the pH changes during an acid-base titration and; * To use these curves to choose suitable indicators for different combinations of acid and alkali. Procedure: 1. 25.0cm3 of 0.100 M ethanoic acid was pipetted into a 100cm3 beaker, a small stirring paddle was added, and the beaker was stood on a magnetic stirrer. 2. The electrode of a pH meter was carefully clamped so that the bulb is completely immersed in the acid and is clear of the stirring paddle. If a magnetic stirrer (or mechanical stirrer) is not available, it is better to swirl the beaker by hand. If a pH meter is not available, it is better to use a conical flask rather than a beaker. 3. A burette with 0.100M ammonia solution was filled and was clamped over the beaker (or flask) containing the acid. 4. A value of the pH of the acid was...
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