Sketch a titration curve (pH versus mL of titrant) for each of the following hypothetical weak bases when titrated with 0.100 M HCl. (Think of these bases as involving the substitution of organic groups, R, for one of the H atoms of NH₃.) Select suitable indicators for the titrations from Figure 17-7.

Figure 17-7

 

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(a) 10.00 mL of 0.100 M RNH2; Kb = 1 × 10-³ (b) 10.00 mL of 0.100 M R'NH₂; Kb = 3 × 106 (c) 10.00 mL of 0.100 M R"NH₂; Kb = 7 × 10-8