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 14.11QAP
Interpretation Introduction

(a)

Interpretation:

A calibration curve from the given data should be plotted.

Concept introduction:

A calibration curve or standard curve is a method used in analytical chemistry to determine the concentration of unknown sample by comparing to a set of samples with known concentrations.

Interpretation Introduction

(b)

Interpretation:

Using the method of least squares, an equation relating absorbance and the concentration of Fe(II) should be developed.

Concept introduction:

For equations,

Syy=(yiy¯)2Sxx=(xix¯)2Sxy=(xix¯)(yiy¯)

The slope of the line, m=SxySxx

The intercept, b=y¯mx¯

Interpretation Introduction

(c)

Interpretation:

The standard deviation of the slope and the intercept should be calculated.

Concept introduction:

Standard deviation about regression, sr=Syym2SxxN2

N − number of points used.

The standard deviation of the slope, sm=sr2Sxx

The standard deviation of the intercept, sb=srxi2Nxi2(xi)2

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