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What is an alkaline error in potentiometriu
Accepted Answer
An alkaline error is a type of error that can occur in potentiometry when the pH of the solution being measured is too high. This can cause the electrode to give a lower reading than the actual concentration of the analyte. The alkaline error is caused by the formation of a hydroxide ion layer on the surface of the electrode, which prevents the analyte from reaching the electrode surface. The magnitude of the alkaline error is proportional to the pH of the solution. Ways to minimise the error include:
- Lowering the pH of the solution by adding acid
- Using a buffer solution to maintain a constant pH
- Using an electrode that is less susceptible to the alkaline error
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