   # At a certain temperature, K = 1.1 × l0 3 for the reaction Fe 3 + ( a q ) + SCN − ( a q ) ⇌ FeSCN 2 + ( a q ) Calculate the concentrations of Fe 3+ , SCN − , and FeSCN 2+ at equilibrium if 0.020 mole of Fe(NO 3 ) 3 is added to 1.0 L of 0.10 M KSCN. (Neglect any volume change.) ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 12, Problem 77AE
Textbook Problem
30 views

## At a certain temperature, K = 1.1 × l03 for the reaction Fe 3 + ( a q ) + SCN − ( a q ) ⇌ FeSCN 2 + ( a q ) Calculate the concentrations of Fe3+, SCN− , and FeSCN2+ at equilibrium if 0.020 mole of Fe(NO3)3 is added to 1.0 L of 0.10 M KSCN. (Neglect any volume change.)

Interpretation Introduction

Interpretation: The equilibrium constant for the production of FeSCN2+(aq) is given. The equilibrium concentration of all species of this reaction is to be calculated when given mole of Fe(NO3)3 is added to 1.0L of 0.10M KSCN .

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,

jA+kBlC+mD

The equilibrium constant is given by,

K=[C]l[D]m[A]j[B]k

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

The equilibrium concentration of [FeSCN2+] is 0.0198M_ .

### Explanation of Solution

Explanation

Given

The equilibrium constant is 1.1×103 .

The 0.020mole of Fe(NO3)3 is added to 1.0L of 0.10M KSCN .

The given reaction is,

Fe3+(aq)+SCN(aq)FeSCN2+(aq)

In this reaction, one mole of Fe(NO3)3 reacts with one mole of KSCN .

Since, the value of K is very large (K>>1) . Therefore, product will dominate.

It is assumed that 0.020M of Fe3+ react completely and the change in concentration of Fe3+(aq) is x .

Make the ICE table for the given reaction.

Fe3+(aq)SCN(aq)FeSCN2+(aq)Initial(M):00.100.020Change(M):x0.020+xxEquilibrium(M):x0.08+x0.020x

The equilibrium constant for the given reaction is,

K=[FeSCN2+][Fe3+][SCN]

Where,

• K is the equilibrium constant.

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

K=[FeSCN2+][Fe3+][SCN]1

### Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

#### The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Find more solutions based on key concepts
Cod is one of the richest sources of the beneficial fatty acids, EPA and DHA. T F

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

Photosynthesis runs on the energy of ___________. a. light b. hydrogen ions c. O2 d. CO2

Biology: The Unity and Diversity of Life (MindTap Course List)

Identify and describe the tissues shown below.

Human Biology (MindTap Course List)

Solving Word Problems

Chemistry In Focus

An __________ is a relationship in which one organism lives inside another.

Biology: The Unity and Diversity of Life (MindTap Course List)

Review. A student proposes to study the gravitational force by suspending two 100.0-kg spherical objects at the...

Physics for Scientists and Engineers, Technology Update (No access codes included)

How does the long chain of Hawaiian volcanoes seem to confirm the theory of plate tectonics?

Oceanography: An Invitation To Marine Science, Loose-leaf Versin 