# (a) Interpretation: Absorbance values of the conjugate acid-base pair solutions of different concentrations at 430 nm and 600 nm should be calculated. Concept introduction: The absorbance can be calculated using the following formula: A = ε bc Where, A = absorbance ε = molar absorptivity b = path length in cm c = concentration of the sample The total absorbance of a conjugate acid-base solution can be calculated as below, HIn ⇔ H + + In − A = ε In - b[In - ] + ε HIn b[HIn - ] For the given conjugate acid-base pair, equilibrium can be written as, HIn + H 2 O ⇔ H 3 O + + In − K a = 8.00 × 10 − 5 = [ H + ] [ In − ] [ HIn ]

### Principles of Instrumental Analysis

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

### Principles of Instrumental Analysis

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

#### Solutions

Chapter 13, Problem 13.11QAP
Interpretation Introduction

## (a)Interpretation:Absorbance values of the conjugate acid-base pair solutions of different concentrations at 430 nm and 600 nm should be calculated.Concept introduction:The absorbance can be calculated using the following formula:A = εbcWhere, A = absorbanceε = molar absorptivityb = path length in cmc = concentration of the sampleThe total absorbance of a conjugate acid-base solution can be calculated as below,HIn ⇔ H+ + In−A = εIn-b[In-] + εHInb[HIn-]For the given conjugate acid-base pair, equilibrium can be written as,HIn + H2O⇔ H3O+ + In−Ka=8.00×10−5=[H+][In−][HIn]

Interpretation Introduction

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