Using Figure 17.11, suggest an indicator to use in each of the following titrations:
(a) The weak base pyridine is titrated with HCl.
(b) Formic acid is titrated with NaOH.
(c) Ethylenediamine, a weak diprotic base, is titrated with HCl.

Data given in Figure 17.11

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2 3 Crystal violet Cresol red Thymol blue 5 6 Erythrosin B 2,4-Dinitrophenol Bromphenol blue Methyl orange Bromcresol green Methyl red 8 Eriochrome black T Bromcresol purple Alizarin 10 Bromthymol blue Phenol red 10 I m-Nitrophenol 11 o-Cresolphthalein Phenolphthalein 12 Thymolphthalein 13 14 Alizarin yellow GG Figure 17.11 Common acid-base indicators. The color changes occur over a range of pH values. Notice that a few indicators have color changes over two different pH ranges.