9th Edition
Steven S. Zumdahl
ISBN: 9781133611097




9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

At a certain temperature, K = 9.1 × 10-4 for the reaction

FeSCN 2 + ( a q ) Fe 3 + ( a q ) + SCN ( a q )

Calculate the concentrations of Fe3+, SCN-, and FeSCN2+ in a solution that is initially 2.0 M FeSCN2+.

Interpretation Introduction

Interpretation: The equilibrium constant and initial concentration of reactant for a given reaction is given. The value of concentration of all species is to be calculated.

Concept introduction: The state when the reactants involved in a chemical reaction and the products formed in the reaction exist in concentrations having no further tendency to change is known as an equilibrium state of the reaction.

For a reaction,


The equilibrium constant is given by,


To determine: The equilibrium concentration of [Fe3+] , [SCN] and [FeSCN2+] for the given reaction.




The equilibrium constant is 9.1×104 .

The initial concentration of reactant is 2.0M .

The given reaction is,


The initial concentration of product Fe3+ and SCN is zero.

It is assumed that the change in concentration of FeSCN2+ is x .

Make the ICE table for the given reaction.


At equilibrium, the equilibrium constant is expressed by the formula,



  • K is the equilibrium constant.

The equilibrium constant for the given reaction is,


Substitute the value of K and equilibrium concentration values in the above expression

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