E2. Base Dissociation Constants at 25°C

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Name	Formula	\(K_b\)	\(pK_b\)
Ammonia	NH₃	1.8 × 10⁻⁵	4.75
Aniline	C₆H₅NH₂	4.0 × 10⁻¹⁰	9.4
n-Butylamine	C₄H₉NH₂	4.0 × 10⁻⁴	3.40
sec-Butylamine	(CH₃)₂CHCH₂NH₂	3.6 × 10⁻⁴	3.44
tert-Butylamine	(CH₃)₃CNH₂	4.8 × 10⁻⁴	3.32
Dimethylamine	(CH₃)₂NH	5.4 × 10⁻⁴	3.27
Ethylamine	C₂H₅NH₂	4.5 × 10⁻⁴	3.35
Hydrazine	N₂H₄	1.3 × 10⁻⁶	5.9
Hydroxylamine	NH₂OH	8.7 × 10⁻⁹	8.06
Methylamine	CH₃NH₂	4.6 × 10⁻⁴	3.34
Propylamine	C₃H₇NH₂	3.5 × 10⁻⁴	3.46
Pyridine	C₅H₅N	1.7 × 10⁻⁹	8.77
Trimethylamine	(CH₃)₃N	6.3 × 10⁻⁵	4.20

Source of data: CRC Handbook of Chemistry and Physics, 84th Edition (2004).

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