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ChemistryChemistry & Chemical Reactivity10th Edition

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Chapter 16, Problem 95GQ
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Chemistry & Chemical Reactivity

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

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Problem 85GQ
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Problem 88GQ
Problem 89GQ
Problem 90GQ
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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
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Chemistry & Chemical Reactivity

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

The local anaesthetic novocaine is the hydrogen chloride salt of an organic base, procaine.

C 13 H 20 N 2 O 2 (aq) + HCl(aq)  →  [HC 13 H 20 N 2 O 2 ] + Cl − (aq)

The pKa for novocaine is 8.85. What is the pH of a 0.0015M solution of novocaine?

Interpretation Introduction

Interpretation:

The pH of a 0.0015M solution of novocaine has to be calculated.

Concept introduction:

Equilibrium constants:

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

Ka: It is an acid constant for equilibrium reactions.

HA + H2O⇌H3O++ A-Ka= [H3O+][A-][HA]

Kb: It is a base constant for equilibrium reaction.

BOH + H2O⇌B++ OH-Ka= [B+][OH-][BOH]

Ion product constant for wter  Kw= [H3O+][OH-]       =1.00×10-14 pH = -log[H3O+]pOH= -log[OH-]

Relation between pH and pOH

 pH + pOH =14

Explanation

The given PKa of novocaine is 8.85.

Let’s calculate the Ka of novocaine.

Pka= -logKaPka= 8.85Ka= -log(8.85)= 1.4×10-9

Therefore,

Ka=1.4×10-9

The chemical equilibrium reaction is as follows.

[HC13H20N2O2]+ (aq) + H2O(l) ⇌H3O+(aq) + C13H20N2O2

Equilibrium expression:

Ka= [H3O+][C13H20N2O2][HC13H20N2O2]+

The initial concentration of is 0.0015M.

Enter the ICE table the concentrations before equilibrium is established, the change that occurs as the reaction proceeds to equilibrium and the concentrations when equilibrium has been achieved.

      [HC13H20N2O2]+ (aq) + H2O(l) ⇌H3O+(aq) + C13H20N2O2I         0.0015M                        --                    --                      --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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