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Experiment 6 Titration II – Acid Dissociation Constant

6-1 Experiment 6 Titration II acid Dissociation Constant Introduction: An acid /base Titration can be monitored with an indicator or with a pH meter. In either case, the goal is to determine the equivalence point of the Titration . This is the point at which enough titrant has been added to the analyte to just exactly neutralize the analyte. In this Experiment , knowledge of the equivalence point will be used to obtain information about the acid Dissociation Constant , Ka, of the acid being titrated. When an indicator is used in a Titration , the color change occurs at what is called the endpoint. If the indicator has been properly selected, this point will be the same as the equivalence point. When a pH meter is used, the pH of the solution is recorded as the titrant is added. The pH versus the volume of titrant added can be plotted on what is called a Titration curve. In this case the equivalence point occurs at the point where very small additions of titrant cause a very rapid rise in the pH.

Titration II – Acid Dissociation Constant Introduction: An acid/base titration can be monitored with an indicator or with a pH meter. In either case, the goal is to determine the equivalence point of the titration. This is the point at which enough titrant has been added to the analyte to just exactly neutralize the analyte. In this

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