Write the chemical formula for the conjugate acid of triethylamine, (C₂H₅)₃N, and calculate its pK_a from the pK_b of triethylamine (see Table 6C.2).

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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 Base urea, CO(NH,) aniline, C6H5NH₂ pyridine, C,H-N hydroxylamine, NH₂OH nicotine, C10H14N2 morphine, C₁7H₁9O3N hydrazine, NH₂NH₂ 1.1 X 10-8 1.0 x 10-6 1.6 X 10-6 1.7 x 10-6 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, C₂H5NH₂ triethylamine, (C₂H5)3N 5 1.8 X 10-5 6.5 x 10-5 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