Write the chemical equation and the Kb expression for the...

Write the chemical equation and the $K_{b}$ expression for the ionization of each of the following bases in aqueous solution: (a) dimethylamine, $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH} ;$ (b) carbonate ion, $\mathrm{CO}_{3}{ }^{2-} ;(\mathrm{c})$ formate ion, $\mathrm{CHO}_{2}^{-}$.

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Key Concepts

Base Ionization in Aqueous Solution

This concept involves the reaction where a base accepts a proton from water, leading to the formation of its conjugate acid and a hydroxide ion. The reaction does not go to completion, meaning an equilibrium is established between the reactants and products. This fundamental understanding is key when analyzing the behavior of weak bases in solution.

Equilibrium Constant Expression (Kb)

This is the expression that quantifies the extent of base ionization at equilibrium. For a generic base B reacting with water to form its conjugate acid BH+ and OH-, the equilibrium constant (Kb) is expressed as Kb = [BH+][OH-] / [B]. This expression is derived from the law of mass action and is used to determine the strength of the base.

Chemical Equation Balancing

Writing balanced chemical equations is essential in describing chemical reactions accurately. In the context of base ionization, it involves ensuring that atoms and charges are balanced in the reaction of the base with water. A correctly balanced equation serves as the foundation for formulating the Kb expression.

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