Question

Complexation titrations with EDTA - Why is the sample buffered to pH 10 and what would happen at a higher or lower pH?

Answer 1

Complexation titrations with EDTA require the sample to be buffered to pH 10 to ensure accurate results. The buffer solution helps maintain a constant pH and facilitates the formation of a stable complex between EDTA and metal ions.

Step-by-step explanation:

Complexation titrations with EDTA require the sample to be buffered to pH 10. This is because at pH 10, the EDTA molecule forms a stable complex with metal ions. The buffer solution helps maintain a constant pH throughout the titration, ensuring accurate results. If the pH is too high or too low, the formation of the complex may be hindered, leading to incorrect titration results.