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 1, Problem 1.11QAP
Interpretation Introduction

(a)

Interpretation:

A standard-addition plot should be created using the data given.

Concept introduction:

A commonform of standard-addition method involves adding known amounts of a standard solution to sample aliquots containing a fixed volume. Measurements taken for each solution can be used to plot a standard-addition plot.

Interpretation Introduction

(b)

Interpretation:

Using the standard-addition plot constructed, the concentration of the unknown phenobarbital sample should be determined.

Concept introduction:

In a standard-addition plot, the graph can be extrapolated to obtain thevolume of standard reagentequivalent to the amount of analyte in the sample ( (Vs)0 ). This value can be used in the following equation to calculate the concentration ( Cx ) of the unknown sample.

Cx=(Vs)0CsVx

Where,

Cs = concentration of the standard

Vx = constant volume of the unknown added to each sample solution.

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