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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.)

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Chemistry: An Atoms First Approach

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

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Section
BuyFindarrow_forward

Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 14, Problem 40E
Textbook Problem
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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]

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Chapter 14 Solutions

Chemistry: An Atoms First Approach
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