During the analysis of an unknown weak base B, a 0.10 m solution of the nitrate salt of the base was found to have a pH of 3.13. Use Table 6C.2 to identify the base.

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TABLE 6C.2 Basicity Constants at 25 °C* Kb 1.3 X 10-14 4.3 X 10-10 1.8 X 10-9 1.1 X 10 8 1.0 x 10-6 1.6 x 10-6 1.7 X 10-6 Base urea, CO(NH,) aniline,C6H5NH₂ pyridine, C,H-N hydroxylamine, NH₂OH nicotine, C₁0H₁4N₂ morphine, C₁7H1903N hydrazine, NH₂NH₂ pKb 13.90 9.37 8.75 7.97 5.98 5.79 5.77 Base ammonia, NH3 trimethylamine, (CH3)3N methylamine, CH3NH₂ dimethylamine, (CH3)2NH ethylamine, C₂H₂NH₂ triethylamine, (C₂H5)3N Kb 1.8 X 10 5 6.5 X 105 3.6 X 10-4 5.4 x 10-4 6.5 x 10-4 1.0 X 10-3 pKb 4.75 4.19 3.44 3.27 3.19 2.99