Select indicators from Table 15-2 that would be suitable for finding the end point in Figure 15-3.
Question:
Select indicators from Table 15-2 that would be suitable for finding the end point in Figure 15-3. What color changes would be observed?
Figure 15-3
Transcribed Image Text:
TABLE 15-2 Redox indicators Color Indicator Oxidized Reduced E° Phenosafranine Red Colorless 0.28 Indigo tetrasulfonate Methylene blue Diphenylamine 4'-Ethoxy-2,4-diaminoazobenzene Diphenylamine sulfonic acid Diphenylbenzidine sulfonic acid Tris(2,2'-bipyridine)iron Tris(1,10-phenanthroline)iron (ferroin) Tris(5-nitro-l,10-phenanthroline)iron Tris(2,2'-bipyridine)ruthenium Blue Colorless 0.36 Blue Colorless 0.53 Violet Colorless 0.75 Yellow Red 0.76 Red-violet Colorless 0.85 Violet Colorless 0.87 Pale blue Red 1.120 Pale blue Red 1.147 Pale blue Red-violet 1.25 Pale blue Yellow 1.29
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