Use Table 21.3 to identify:

a. Those indicators which could be used for a strong acid–strong base titration like the one in Figure 21.8.

b. Those indicators that could not be used.

Transcribed Image Text:

Name of dye Colour at lower pH pH range End-point Colour at higher pH methyl violet yellow 0.0-1.6 0.8 blue methyl yellow methyl orange bromophenol blue yellow bromocresol green yellow red 2.9-4.0 3.5 yellow red 3.2-4.4 3.7 yellow 2.8-4.6 4.0 blue 3.8-5.4 4.7 blue methyl red red 4.2-6.3 5.1 yellow bromothymol blue yellow 6.0-7.6 blue Table 21.3 Some of the 7.0 chemical indicators used to phenolphthalein colourless 8.2-10.0 9.3 pink/violet monitor pH, with their pH ranges of use and pH of end-point. alizarin yellow yellow 10.1-13.0 12.5 orange/red