   Chapter 13, Problem 19Q

Chapter
Section
Textbook Problem

# For a typical equilibrium problem, the value of K and the initial reaction conditions are given for a specific reaction, and you are asked to calculate the equilibrium concentrations. Many of these calculations involve solving a quadratic or cubic equation. What can you do to avoid solving a quadratic or cubic equation and still come up with reasonable equilibrium concentrations?

Interpretation Introduction

Interpretation: The procedure used to avoid solving a quadratic or a cubic equation and still obtaining a reasonable equilibrium concentration is to be stated.

Concept introduction: An ICE table comprises of the concentrations of the molecules present in a given solution at different stages of a chemical reaction. ICE stands for ‘Initial Change Equilibrium’. It is a tabular form that helps to keep a track of the change in concentrations in a stated equilibrium reaction.

To determine: The procedure used to avoid solving a quadratic or a cubic equation and still obtaining a reasonable equilibrium concentration.

Explanation

An ICE table comprises of the concentrations of the molecules present in a given solution at different stages of a chemical reaction. ICE stands for Initial Change Equilibrium.

It is a tabular form that helps to keep a track of the change in concentrations in a stated equilibrium reaction.

An ICE table is constructed using the given K and the initial concentration values.

An equation in terms of an unknown variable is determined from the constructed ICE table.

The change in the reactant concentration is taken as negligible. This is the assumption made in solving these kinds of problems.

The validation of the result obtained is checked by the ‘ 5% rule’

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