BuyFind

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213
BuyFind

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213

Solutions

Chapter 14, Problem 14.10QAP
Interpretation Introduction

(a)

Interpretation:

Molar absorptivities for In- and HIn at 485 and 625 nm should be calculated.

Concept introduction:

The Beer-Lambert Law is:

A=εlc

A − absorbance

ε - molar absorptivity

l − length of the solution light passes through (cm)

c − concentration of solution (mol/L)

Interpretation Introduction

(b)

Interpretation:

The acid dissociation constant of the indicator should be calculated.

Concept introduction:

The Beer-Lambert Law is:

A=εlc

A − absorbance

ε - molar absorptivity

l − length of the solution light passes through (cm)

c − concentration of solution (mol/L)

Interpretation Introduction

(c)

Interpretation:

pH of the solution should be calculated.

Concept introduction:

The formula used to determine the pH is:

pH=log[H+]

Where, [H+] represents concentration of H+ ions.

Interpretation Introduction

(d)

Interpretation:

The pH of the solution and Ka for the weak acid should be determined.

Concept introduction:

The formula used to determine the pH is:

pH=log[H+]

Where, [H+] represents concentration of H+ ions.

Interpretation Introduction

(e)

Interpretation:

Absorbance of a solution at 485 and 625 nm should be determined.

Concept introduction:

The Beer-Lambert Law is:

A=εlc

A − absorbance

ε - molar absorptivity

l − length of the solution light passes through (cm)

c − concentration of solution (mol/L)

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