Chart: Base Ionization Constants

**Base Ionization Constants at 25°C**
Name of Base	Ionization Equation	$K_b$
Methylamine	$text{CH}_3text{NH}_2 + text{H}_2text{O} rightleftarrows text{CH}_3text{NH}^+_3 + text{OH}^-$	$5.6 times 10^{-4}$
Ammonia	$text{NH}_3 + text{H}_2text{O} rightleftarrows text{NH}^+_4 + text{OH}^-$	$1.8 times 10^{-5}$
Pyridine	$text{C}_5text{H}_5text{N} + text{H}_2text{O} rightleftarrows text{C}_2text{H}_5text{NH}^+ + text{OH}^-$	$1.7 times 10^{-9}$
Acetate ion	$text{CH}_3text{COO}^- + text{H}_2text{O} rightleftarrows text{CH}_3text{COOH} + text{OH}^-$	$5.6 times 10^{-10}$
Fluoride ion	$text{F} + text{H}_2text{O} rightleftarrows text{HF} + text{OH}^-$	$1.4 times 10^{-11}$
Urea	$text{H}_2text{NCONH}_2+ text{H}_2text{O} rightleftarrows text{H}_2text{NCONH}^+_3 + text{OH}^-$	$1.5 times 10^{-14}$

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