   # Methylamine, CH 3 NH 2 , is a weak base. CH 3 NH 2 (aq) + H 2 O(ℓ) ⇄ CH 3 NH 3 + (aq) + OH − (aq) If the pH of a 0.065 M solution of the amine is 11.70, what is the value of K b ? ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

#### Solutions

Chapter
Section ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 16, Problem 46PS
Textbook Problem
180 views

## Methylamine, CH3NH2, is a weak base.CH3NH2(aq) + H2O(ℓ) ⇄ CH3NH3+(aq) + OH−(aq)If the pH of a 0.065 M solution of the amine is 11.70, what is the value of Kb?

Interpretation Introduction

Interpretation:

The base ionization constant (Kb) of weak base methylamine has to be ientified.

Concept introduction:

The base dissociation constant or base ionization constant of weak base methylamine. can be calculated by using the pOH value of methylamine. base (which gives the concentration of hydroxide ion) and from the given concentration of. weak base methylamine.

### Explanation of Solution

Given data

The pH of the methylamine.base is 11.70

The concentration of methylamine base is 0.065M

Calculate the base dissociation constant (Kb) for the base as follows -

It is known that:pH + pOH = 14

pOH = 14 - pH =14 - 11.70=2.3

Therefore, [OH] can be calculated as:

pOH=log[OH]2.30=log[OH][OH]=5.0×103M

The ICE Table for the dissociation of methylamine base is represented as below:

EquilibriumCH3NH2(aq)+H2O(l)CH3NH3+(aq)+OH(aq)Initial(M)0.06500Change(M)x+x+xEquilibrium(M)0

### 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
The Academy of Nutrition and Dietetics recommends fluoride-free water for the U.S. population. T F

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

What is the structure and function of the cytoskeleton?

Biology: The Dynamic Science (MindTap Course List)

Give Lewis diagram for all amines with the formula C2H7N and name them.

Introductory Chemistry: An Active Learning Approach

Come up with a procedure to find the focal length of a concave mirror, such as a spoon.

Physics for Scientists and Engineers: Foundations and Connections

The pilot of an airplane executes a loop-the-loop maneuver in a vertical circle. The speed of the airplane is 3...

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

How is an erosional coast different from a depositional coast?

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