What is the Kb expression for the reaction of ethylamine with water?

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

What is the Kb expression for the reaction of ethylamine with water? (1) Kb=[CH3CH2NH3+][OH−]K_b = [\text{CH}_3\text{CH}_2\text{NH}_3^+][\text{OH}^-] (2) Kb=[CH3CH2NH3+][OH−][CH3CH2NH2]K_b = \frac{[\text{CH}_3\text{CH}_2\text{NH}_3^+][\text{OH}^-]}{[\text{CH}_3\text{CH}_2\text{NH}_2]} (3) Kb=[CH3CH2NH3+][H2O][CH3CH2NH2]K_b = \frac{[\text{CH}_3\text{CH}_2\text{NH}_3^+][\text{H}_2\text{O}]}{[\text{CH}_3\text{CH}_2\text{NH}_2]} (4) Kb=[CH3CH2NH2][H2O]K_b = [\text{CH}_3\text{CH}_2\text{NH}_2][\text{H}_2\text{O}]

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