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ChemistryPrinciples of Instrumental Analysis(a) Interpretation: Molar absorptivities for In- and HIn at 485 and 625 nm should be calculated. Concept introduction: The Beer-Lambert Law is: A = ε l c A − absorbance ε - molar absorptivity l − length of the solution light passes through (cm) c − concentration of solution (mol/L)Start your trial now! First week only $4.99!*arrow_forward*

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7th Edition

Douglas A. Skoog + 2 others

Publisher: Cengage Learning

ISBN: 9781305577213

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 − absorbance

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 − absorbance

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:

Where,

Interpretation Introduction

**(d)**

**Interpretation:**

The pH of the solution and K_{a} for the weak acid should be determined.

**Concept introduction:**

The formula used to determine the pH is:

Where,

Interpretation Introduction

**(e)**

**Interpretation:**

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

**Concept introduction:**

The Beer-Lambert Law is:

A − absorbance

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

c − concentration of solution (mol/L)