   # An aqueous solution contains dissolved C 6 H 5 NH 3 Cl and C 6 H 5 NH 2 . The concentration of C 6 H 5 NH 2 is 0.50 M and pH is 4.20. a. Calculate the concentration of C 6 H 5 NH 3 + in this buffer solution. b. Calculate the pH after 4.0 g NaOH( s ) is added to 1.0 L of this solution. (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 14, Problem 40E
Textbook Problem
79 views

## An aqueous solution contains dissolved C6H5NH3Cl and C6H5NH2. The concentration of C6H5NH2 is 0.50 M and pH is 4.20.a. Calculate the concentration of C6H5NH3+ in this buffer solution.b. Calculate the pH after 4.0 g NaOH(s) is added to 1.0 L of this solution. (Neglect any volume change.)

(a)

Interpretation Introduction

Interpretation:

The concentration of C6H5NH2 and pH of a solution is given. The concentration of C6H5NH3+ is to be calculated. The pH of solution after addition of 4.0g of NaOH is to be calculated

Concept introduction:

The pOH value is the measure of OH ions. The relation between pOH and pKb is given by Henderson-Hassel Bach equation. According to this equation,

pOH=pKb+log[Conjugateacid][Weakbase]

To determine: The pOH value of the solution and concentration of C6H5NH3+ .

### Explanation of Solution

Explanation

The value of pH of solution is 4.20 .

The relation between pH and pOH is,

pH+pOH=14

Where,

• pH is a measure of concentration of H+ .
• pOH is a measure of concentration of OH .

Substitute the value of pOH in above equation.

pH+pOH=14pOH+4.20=14pOH=9.80_

To determine the concentration of C6H5NH3+

The pOH of solution is 9.80 .

The concentration of C6H5NH2 is 0.50M .

The value of Kb for C6H5NH2 is 3.8×1010 .

The pOH is calculated using the Henderson-Hassel Bach equation,

pOH=pKb+log[C6H5NH3+][C6H5NH2] (1)

Where,

• pOH is the measure of OH ions.
• pKb is the measure of basic strength.
• [C6H5NH3+] is the concentration of C6H5NH3+ .
• [C6H5NH2] is the concentration of C6H5NH2

(b)

Interpretation Introduction

Interpretation:

The concentration of C6H5NH2 and pH of a solution is given. The concentration of C6H5NH3+ is to be calculated. The pH of solution after addition of 4.0g of NaOH is to be calculated

Concept introduction:

The pOH value is the measure of OH ions. The relation between pOH and pKb is given by Henderson-Hassel Bach equation. According to this equation,

pOH=pKb+log[Conjugateacid][Weakbase]

### 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
A built environment can support physical activity with a. safe biking and walking lanes. b. public parks. c. fr...

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

Describe the chemical composition of gasoline.

Chemistry for Engineering Students

What is the structure and function of the extracellular matrix?

Biology: The Dynamic Science (MindTap Course List)

List the functions of the cardiovascular system.

Human Biology (MindTap Course List)

A Styrofoam cup holding 125 g of hot water at 100C cools to room temperature. 20.0C. What is the change in entr...

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