Question 16.7: Which indicator(s) listed in Table 16.1 would you use for th...

Which indicator(s) listed in Table 16.1 would you use for the acid-base titrations shown in (a) Figure 16.4, (b) Figure 16.5, and (c) Figure 16.6? Strategy The choice of an indicator for a particular titration is based on the fact that its pH range for color change must overlap the steep portion of the titration curve. Otherwise we cannot use the color change to locate the equivalence point.

			Table 16.1 Some Common Acid-Base Indicators
		Color
pH Range	In Base	In Acid	Indicator
1.2-2.8	yellow	Red	Thymol blue
3.0-4.6	Bluish purple	Yellow	Bromophenol blue
3.1-4.4	yellow	Orange	Methyl orange
4.2-6.3	yellow	Red	Methyl red
4.8-6.4	Red	Yellow	Chlorophenol blue
6.0-7.6	Blue	Yellow	Cresol red
7.2-8.8	Red	Yellow	Phenolphthalein
8.3-10.0	Reddish pink	Colorless

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