   Chapter 16, Problem 15PS

Chapter
Section
Textbook Problem

Write an equilibrium constant expression for the reaction of ammonium ion, a weak acid, with water.

Interpretation Introduction

Interpretation: The equilibrium constant expression for the reaction of ammonium ion with water has to be written.

Concept introduction: An equilibrium constant (K) is the ratio of concentration of products and reactants raised to appropriate stoichiometric coefficient at equlibrium.

For the general acid HA,

HA(aq)+H2O(l)H3O+(aq)+A(aq)

The relative strength of an acid and base in water can be also expressed quantitatively with an equilibrium constant as follows:

Ka=[H3O+][A][HA] (1)

An equilibrium constant (K) with subscript a indicate that it is an equilibrium constant of an acid in water.

Explanation

Ammonium ion is a weak acid because it ionizes only to a small extent in water. The reaction of ammonium ion with water as follows:

NH4+(aq)+H2O(l)NH3(aq)+H3O+(aq

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