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ChemistryChemistry & Chemical Reactivity10th Edition

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Chapter 16, Problem 96GQ
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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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Problem 1PS
Problem 2PS
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Problem 4PS
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Problem 6PS
Problem 7PS
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Problem 18PS
Problem 19PS
Problem 20PS
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Problem 22PS
Problem 23PS
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Problem 31PS
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Problem 38PS
Problem 39PS
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Problem 49PS
Problem 50PS
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Problem 53PS
Problem 54PS
Problem 55PS
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Problem 71PS
Problem 72PS
Problem 73PS
Problem 74PS
Problem 75PS
Problem 76PS
Problem 77PS
Problem 78PS
Problem 79PS
Problem 80PS
Problem 81PS
Problem 82PS
Problem 83PS
Problem 84PS
Problem 85GQ
Problem 86GQ
Problem 87GQ
Problem 88GQ
Problem 89GQ
Problem 90GQ
Problem 91GQ
Problem 92GQ
Problem 93GQ
Problem 94GQ
Problem 95GQ
Problem 96GQ
Problem 97GQ
Problem 98GQ
Problem 99GQ
Problem 100GQ
Problem 101GQ
Problem 102GQ
Problem 103GQ
Problem 104GQ
Problem 105GQ
Problem 106GQ
Problem 107GQ
Problem 108GQ
Problem 109GQ
Problem 110GQ
Problem 111IL
Problem 112IL
Problem 113IL
Problem 114IL
Problem 115IL
Problem 116IL
Problem 117IL
Problem 118IL
Problem 119SCQ
Problem 120SCQ
Problem 121SCQ
Problem 122SCQ
Problem 123SCQ
Problem 124SCQ
Problem 125SCQ
Problem 126SCQ
Problem 127SCQ
Problem 128SCQ
Problem 129SCQ
BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Pyridine is weak organic base and readily forms a salt with hydrochloric acid.

C 5 H 5 N(aq) + HCl(aq)  →  C 5 H 5 NH + (aq) + Cl − (aq)    Pyridine                          Pyridinium ion

What is the pH of a 0.025 M solution of pyridinium hydrochloride [C 5 H 5 NH + ]Cl − ?

Interpretation Introduction

Interpretation:

The pH of 0.025M solution of pyridinium hydrochloride has to be determined.

Concept introduction:

Equilibrium constants:

The equilibrium constant is used to quantitative measurement of the strength of the acid and bases in the water.

Ka is an acid constant for equilibrium reactions.

HA + H2O⇌H3O++ A-Ka= [H3O+][A-][HA]

Kb is a base constant for equilibrium reaction.

BOH + H2O⇌B++ OH-Ka= [B+][OH-][BOH]

Ion product constant for water

  Kw= [H3O+][OH-]       =1.00×10-14 pH = -log[H3O+]pOH= -log[OH-]

Relation between pH and pOH

 pH + pOH =14

Explanation

Let’s calculate the Ka of C5H5NH+

The Kb of 1.5× 10-9

Ka×Kb = KwKa= KwKbKw= 1.0×10-14Kb = 1.5×10-9

Substitute the values,

Ka= 1.0×10-141.5×10-9     = 6.7×10-6

The equilibrium chemical reaction is as follows.

C5H5NH+(aq) + H2O⇌H3O+(aq) + C5H5N(aq)

The equilibrium expression:

Ka= [C5H5N][H3O+][C5H5NH+]

The initial concentration of pyridinium ion is 0.025M.

      C5H5NH+(aq) + H2O(l) ⇌H3O+(aq) + C5H5N(aq)I         0.025M              --                --                     --C           -x                    --              + x                  + xE        (0

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Sect-16.2 P-16.1CYUSect-16.4 P-16.2CYUSect-16.5 P-16.3CYUSect-16.7 P-16.4CYUSect-16.7 P-16.5CYUSect-16.7 P-16.6CYUSect-16.7 P-16.7CYUSect-16.7 P-16.8CYUSect-16.8 P-16.9CYUSect-16.10 P-1.1ACP
Sect-16.10 P-1.2ACPSect-16.10 P-1.3ACPSect-16.10 P-2.1ACPSect-16.10 P-2.2ACPSect-16.10 P-2.3ACPSect-16.10 P-2.4ACPSect-16.10 P-2.5ACPCh-16 P-1PSCh-16 P-2PSCh-16 P-3PSCh-16 P-4PSCh-16 P-5PSCh-16 P-6PSCh-16 P-7PSCh-16 P-8PSCh-16 P-9PSCh-16 P-10PSCh-16 P-11PSCh-16 P-12PSCh-16 P-13PSCh-16 P-14PSCh-16 P-15PSCh-16 P-16PSCh-16 P-17PSCh-16 P-18PSCh-16 P-19PSCh-16 P-20PSCh-16 P-21PSCh-16 P-22PSCh-16 P-23PSCh-16 P-24PSCh-16 P-25PSCh-16 P-26PSCh-16 P-27PSCh-16 P-28PSCh-16 P-29PSCh-16 P-30PSCh-16 P-31PSCh-16 P-32PSCh-16 P-33PSCh-16 P-34PSCh-16 P-35PSCh-16 P-36PSCh-16 P-37PSCh-16 P-38PSCh-16 P-39PSCh-16 P-40PSCh-16 P-41PSCh-16 P-42PSCh-16 P-43PSCh-16 P-44PSCh-16 P-45PSCh-16 P-46PSCh-16 P-47PSCh-16 P-48PSCh-16 P-49PSCh-16 P-50PSCh-16 P-51PSCh-16 P-52PSCh-16 P-53PSCh-16 P-54PSCh-16 P-55PSCh-16 P-56PSCh-16 P-57PSCh-16 P-58PSCh-16 P-59PSCh-16 P-60PSCh-16 P-61PSCh-16 P-62PSCh-16 P-63PSCh-16 P-64PSCh-16 P-65PSCh-16 P-66PSCh-16 P-67PSCh-16 P-68PSCh-16 P-69PSCh-16 P-70PSCh-16 P-71PSCh-16 P-72PSCh-16 P-73PSCh-16 P-74PSCh-16 P-75PSCh-16 P-76PSCh-16 P-77PSCh-16 P-78PSCh-16 P-79PSCh-16 P-80PSCh-16 P-81PSCh-16 P-82PSCh-16 P-83PSCh-16 P-84PSCh-16 P-85GQCh-16 P-86GQCh-16 P-87GQCh-16 P-88GQCh-16 P-89GQCh-16 P-90GQCh-16 P-91GQCh-16 P-92GQCh-16 P-93GQCh-16 P-94GQCh-16 P-95GQCh-16 P-96GQCh-16 P-97GQCh-16 P-98GQCh-16 P-99GQCh-16 P-100GQCh-16 P-101GQCh-16 P-102GQCh-16 P-103GQCh-16 P-104GQCh-16 P-105GQCh-16 P-106GQCh-16 P-107GQCh-16 P-108GQCh-16 P-109GQCh-16 P-110GQCh-16 P-111ILCh-16 P-112ILCh-16 P-113ILCh-16 P-114ILCh-16 P-115ILCh-16 P-116ILCh-16 P-117ILCh-16 P-118ILCh-16 P-119SCQCh-16 P-120SCQCh-16 P-121SCQCh-16 P-122SCQCh-16 P-123SCQCh-16 P-124SCQCh-16 P-125SCQCh-16 P-126SCQCh-16 P-127SCQCh-16 P-128SCQCh-16 P-129SCQ

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