Which of the following indicators in Table 6H.2 could you use for a titration of 0.20 m NH₃(aq) with 0.20 m HCl(aq):

(a) Bromocresol green;

(b) Methyl red;

(c) Phenol red;

(d) Thymol blue? Explain your selections.

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TABLE 6H.2 Indicator Color Changes* pH range of color change Indicator thymol blue methyl orange bromophenol blue bromocresol green methyl red litmus bromothymol blue phenol red thymol blue phenolphthalein alizarin yellow R alizarin pKin 1.7 3.4 3.9 4.7 5.0 6.5 7.1 7.9 8.9 9.4 11.2 11.7 1.2 to 2.8 3.2 to 4.4 3.0 to 4.6 3.8 to 5.4 4.8 to 6.0 5.0 to 8.0 6.0 to 7.6 6.6 to 8.0 8.0 to 9.6 8.2 to 10.0 10.1 to 12.0 11.0 to 12.4 Color of acid form red red yellow yellow red red yellow yellow yellow colorless yellow red Color of base form yellow yellow blue blue yellow blue blue red blue pink red purple