Pyrocatechol violet (Table 11-3) is to be used as a metal ion indicator in an EDTA
Chapter 11, Problem 11-26(choose chapter or problem)
Pyrocatechol violet (Table 11-3) is to be used as a metal ion indicator in an EDTA titration. The procedure is as follows: 1. Add a known excess of EDTA to the unknown metal ion. 2. Adjust the pH with a suitable buffer. 3. Back-titrate the excess chelate with standard Al3. From the following available buffers, select the best buffer, and then state what color change will be observed at the end point. Explain your answer. (a) pH 67 (b) pH 78 (c) pH 89 (d) pH 910
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