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Chapter 16, Problem 16.146QP

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CHEMISTRY: ATOMS FIRST VOL 1 W/CON...

14th Edition
Burdge
ISBN: 9781259327933

Solutions

Chapter
Section
FindFindarrow_forward

CHEMISTRY: ATOMS FIRST VOL 1 W/CON...

14th Edition
Burdge
ISBN: 9781259327933

(a)

Interpretation Introduction

Interpretation:

An expression for the pH of a strong acid solution, including the contribution to [H+] from H2O has to be derived

Concept Information:

Strong acids:

In strong acids, complete ionization of acid takes place.  This implies that the hydrogen ion or hydronium ion concentration will be equal to the initial concentration of the acid at equilibrium.

Autoionization of water:

The autoionization of water is written as,

2H2OH3O+(aq)+OH-(aq)

The equation of equilibrium for autoionization of water is,

Kw=[H+][OH-]

The equilibrium expression for water at 25oC is,

[H+][OH-]= 1×10-14

Therefore,

Kw=[H+][OH-]     = 1×10-14

pH definition:

The concentration of hydrogen ion is measured using pH scale.  The acidity of aqueous solution is expressed by pH scale.

The pH of a solution is defined as the negative base-10 logarithm of the hydrogen or hydronium ion concentration.

pH=-log[H3O+]

To Derive: An expression for the pH of a strong acid solution, including the contribution to [H+] from H2O

(b)

Interpretation Introduction

Interpretation:

The pH of a 1.0×10-7M HCl solution has to be calculated

Concept Information:

Strong acids:

In strong acids, complete ionization of acid takes place.  This implies that the hydrogen ion or hydronium ion concentration will be equal to the initial concentration of the acid at equilibrium.

Autoionization of water:

The autoionization of water is written as,

2H2OH3O+(aq)+OH-(aq)

The equation of equilibrium for autoionization of water is,

Kw=[H+][OH-]

The equilibrium expression for water at 25oC is,

[H+][OH-]= 1×10-14

Therefore,

Kw=[H+][OH-]     = 1×10-14

pH definition:

The concentration of hydrogen ion is measured using pH scale.  The acidity of aqueous solution is expressed by pH scale.

The pH of a solution is defined as the negative base-10 logarithm of the hydrogen or hydronium ion concentration.

pH=-log[H3O+]

To Calculate: The pH of a 1.0×10-7M HCl solution

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