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ChemistryChemistry9th Edition

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Chapter 15, Problem 102CWP
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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

Solutions

Chapter
Section
Problem 1RQ
Problem 2RQ
Problem 3RQ
Problem 4RQ
Problem 5RQ
Problem 6RQ
Problem 7RQ
Problem 8RQ
Problem 9RQ
Problem 10RQ
Problem 1ALQ
Problem 2ALQ
Problem 3ALQ
Problem 4ALQ
Problem 5ALQ
Problem 6ALQ
Problem 7ALQ
Problem 8ALQ
Problem 9Q
Problem 10Q
Problem 11Q
Problem 12Q
Problem 13Q
Problem 14Q
Problem 15Q
Problem 16Q
Problem 17E
Problem 18E
Problem 19E
Problem 20E
Problem 21E
Problem 22E
Problem 23E
Problem 24E
Problem 25E
Problem 26E
Problem 27E
Problem 28E
Problem 29E
Problem 30E
Problem 31E
Problem 32E
Problem 33E
Problem 34E
Problem 35E
Problem 36E
Problem 37E
Problem 38E
Problem 39E
Problem 40E
Problem 41E
Problem 42E
Problem 43E
Problem 44E
Problem 45E
Problem 46E
Problem 47E
Problem 48E
Problem 49E
Problem 50E
Problem 51E
Problem 52E
Problem 53E
Problem 54E
Problem 55E
Problem 56E
Problem 57E
Problem 58E
Problem 59E
Problem 60E
Problem 61E
Problem 62E
Problem 63E
Problem 64E
Problem 65E
Problem 66E
Problem 67E
Problem 68E
Problem 69E
Problem 70E
Problem 71E
Problem 72E
Problem 73E
Problem 74E
Problem 75E
Problem 76E
Problem 77E
Problem 78E
Problem 79E
Problem 80E
Problem 81AE
Problem 82AE
Problem 83AE
Problem 84AE
Problem 85AE
Problem 86AE
Problem 87AE
Problem 88AE
Problem 89AE
Problem 90AE
Problem 91AE
Problem 92AE
Problem 93AE
Problem 94AE
Problem 95AE
Problem 96AE
Problem 97AE
Problem 98AE
Problem 99AE
Problem 100CWP
Problem 101CWP
Problem 102CWP
Problem 103CWP
Problem 104CWP
Problem 105CWP
Problem 106CWP
Problem 107CWP
Problem 108CP
Problem 109CP
Problem 110CP
Problem 111CP
Problem 112CP
Problem 113CP
Problem 114CP
Problem 115CP
Problem 116CP
Problem 117CP
Problem 118CP
Problem 119IP
Problem 120IP
Problem 121IP
Problem 122MP
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Chemistry

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

Consider the following acids and bases:

HCO2H Ka = 1.8 × 10−4
HOBr Ka = 2.0 × 10−9
(C2H5)2NH Kb = 1.3 × 10−3
HONH2 Kb = 1.1 × 10−8

Choose substances from the following list that would be the best choice to prepare a pH = 9.0 buffer solution.

a. HCO2H

b. HOBr

c. KHCO2

d. HONH3NO3

e. (C2H5)2NH

f. (C2H5)2NH2Cl

g. HONH2

h. NaOBr

Interpretation Introduction

Interpretation: To prepare a buffer solution of pH-9, the pair of acid base is to be chosen from the given combination.

Concept introduction: The buffer solutions are the solutions which resist the pH of the solution even on the external addition of the acid or the base.

The buffer solution having the pH-7 is known as a neutral buffer solution.

In the acidic buffer solution, the acid with their salt is present while in basic buffer, the base with the respective salt is present.

If the pH of the buffer solution is more than 7, then it is called basic buffer and if less, then it is acidic.

The hydrogen ion concentration of the solution is known as pH of the solution.

It is the negative logarithm of Hydrogen ion concentration.

Explanation

Given

The given compounds with their respective Ka and Kb value are,

HCOOHKa=1.8×10−4HOBrKa=2.0×10−9(C2H5)NHKb=1.3×10−3NH2OHKb=1.1×10−8

The pH of the buffer solution is 9.0.

The given pH value clearly indicates that the buffer solution is basic buffer.

pKa is the negative logarithm of ka.

For any basic buffer, pH range is always ±1 to pKa.

Therefore,

pH=pKa±1

Substitute the value of pH of 9 in the above equation.

pH=pKa±19=pKa±1pKa=9±1

Therefore, the value of pKa lies in the range 8−10

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Ch-15 P-1RQCh-15 P-2RQCh-15 P-3RQCh-15 P-4RQCh-15 P-5RQCh-15 P-6RQCh-15 P-7RQCh-15 P-8RQCh-15 P-9RQCh-15 P-10RQ
Ch-15 P-1ALQCh-15 P-2ALQCh-15 P-3ALQCh-15 P-4ALQCh-15 P-5ALQCh-15 P-6ALQCh-15 P-7ALQCh-15 P-8ALQCh-15 P-9QCh-15 P-10QCh-15 P-11QCh-15 P-12QCh-15 P-13QCh-15 P-14QCh-15 P-15QCh-15 P-16QCh-15 P-17ECh-15 P-18ECh-15 P-19ECh-15 P-20ECh-15 P-21ECh-15 P-22ECh-15 P-23ECh-15 P-24ECh-15 P-25ECh-15 P-26ECh-15 P-27ECh-15 P-28ECh-15 P-29ECh-15 P-30ECh-15 P-31ECh-15 P-32ECh-15 P-33ECh-15 P-34ECh-15 P-35ECh-15 P-36ECh-15 P-37ECh-15 P-38ECh-15 P-39ECh-15 P-40ECh-15 P-41ECh-15 P-42ECh-15 P-43ECh-15 P-44ECh-15 P-45ECh-15 P-46ECh-15 P-47ECh-15 P-48ECh-15 P-49ECh-15 P-50ECh-15 P-51ECh-15 P-52ECh-15 P-53ECh-15 P-54ECh-15 P-55ECh-15 P-56ECh-15 P-57ECh-15 P-58ECh-15 P-59ECh-15 P-60ECh-15 P-61ECh-15 P-62ECh-15 P-63ECh-15 P-64ECh-15 P-65ECh-15 P-66ECh-15 P-67ECh-15 P-68ECh-15 P-69ECh-15 P-70ECh-15 P-71ECh-15 P-72ECh-15 P-73ECh-15 P-74ECh-15 P-75ECh-15 P-76ECh-15 P-77ECh-15 P-78ECh-15 P-79ECh-15 P-80ECh-15 P-81AECh-15 P-82AECh-15 P-83AECh-15 P-84AECh-15 P-85AECh-15 P-86AECh-15 P-87AECh-15 P-88AECh-15 P-89AECh-15 P-90AECh-15 P-91AECh-15 P-92AECh-15 P-93AECh-15 P-94AECh-15 P-95AECh-15 P-96AECh-15 P-97AECh-15 P-98AECh-15 P-99AECh-15 P-100CWPCh-15 P-101CWPCh-15 P-102CWPCh-15 P-103CWPCh-15 P-104CWPCh-15 P-105CWPCh-15 P-106CWPCh-15 P-107CWPCh-15 P-108CPCh-15 P-109CPCh-15 P-110CPCh-15 P-111CPCh-15 P-112CPCh-15 P-113CPCh-15 P-114CPCh-15 P-115CPCh-15 P-116CPCh-15 P-117CPCh-15 P-118CPCh-15 P-119IPCh-15 P-120IPCh-15 P-121IPCh-15 P-122MP

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