Write the chemical equation for the ionization of dimethylamine. (ch3)2nh in aqueous solution.

Write the chemical equation and the Kb expression for the ionization of each of the following bases in aqueous solution. (Use the lowest possible coefficients. Omit states-of-matter in your answer.)

(a) dimethylamine, (CH3)2NH chemical equation

Kb expression

(b) carbonate ion, CO32- chemical equation

Kb expression

(c) formate ion, CHO2?
chemical equation

Kb expression

Answer

(a) dimethylamine, (CH3)2NH chemical equation

Kb expression --> Kb = [products]/[reactants]

(CH3)2NH + H2O <-> (CH3)2NH2+(aq) + OH-(aq)

Kb = [(CH3)2NH2+][OH-] / [(CH3)2NH]

[H2O] = 1; acitvity = 1

(b) carbonate ion, CO32- chemical equation

Kb expression

CO3-2 + H2O <-> HCO3- + OH-

Kb = [HCO3-][OH-]/[CO3-2]

(c) formate ion, CHO2-

CHOO- + H2O <-> CHOOH + OH-

Kb expression

Kb = [CHOOH ][OH-]/[CHOO-]

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