Question

Be sure to answer all parts. Write a balanced equation and Kb expression for the following Brønsted-Lowry base in water: benzoate ion, C6H5COO−. Include the states of all reactants and products in your equation. You do not need to include states in the equilibrium expression. Balanced equation: ⇌ Kb expression:

Answer 1

The balanced reaction is:-

`C_6H_5COO^-_((aq)) + H_2O_((l))\rightleftharpoons C_6H_5COOH_((aq)) + OH^-_((aq))`

`K_b` expression is:-

`K_(b)=\frac {\left [ C_6H_5COOH \right ]\left [ {OH}^- \right ]}{[C_6H_5COO^-]}`

Step-by-step explanation:

Benzoate ion is the conjugate base of the benzoic acid. It is a Bronsted-Lowry base and the dissociation of benzoate ion can be shown as:-

`C_6H_5COO^-_((aq)) + H_2O_((l))\rightleftharpoons C_6H_5COOH_((aq)) + OH^-_((aq))`

The expression for dissociation constant of benzoate ion is:

`K_(b)=\frac {\left [ C_6H_5COOH \right ]\left [ {OH}^- \right ]}{[C_6H_5COO^-]}`