(a) Interpretation: A graph should be plotted using the spreadsheet for given information. Concept introduction: In this context chromium in an aqueous solution is determined by pipetting 10.0 mL of unknown into each of 5 50.0 mL volumetric flasks. The following data is given in the question: Unknown, mL Standard, mL Absorbance 10.0 0.0 0.201 10.0 10.0 0.292 10.0 20.0 0.378 10.0 30.0 0.467 10.0 40.0 0.554

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 9, Problem 9.22QAP
Interpretation Introduction

(a)

Interpretation:

A graph should be plotted using the spreadsheet for given information.

Concept introduction:

In this context chromium in an aqueous solution is determined by pipetting 10.0 mL of unknown into each of 5 50.0 mL volumetric flasks.

The following data is given in the question:

Unknown, mL Standard, mL Absorbance
10.0 0.0 0.201
10.0 10.0 0.292
10.0 20.0 0.378
10.0 30.0 0.467
10.0 40.0 0.554

Interpretation Introduction

(b)

Interpretation:

The equation for relating absorbance and volume of standard should be determined.

Concept introduction:

In this context chromium in an aqueous solution is determined by pipetting 10.0mL of unknown into each of 5 50.0mL volumetric flasks.

The following data is given in the question:

Unknown,mL Standard, mL Absorbance
10.0 0.0 0.201
10.0 10.0 0.292
10.0 20.0 0.378
10.0 30.0 0.467
10.0 40.0 0.554

Absorbance increases directly as the concentration of the solution of the sample is increased during the experiment. Also, it increases as the length of the light that is also equal to the width of the cuvette.

Volume of the solution also refers to the concentration of solute present in the given volume of the solution.

Interpretation Introduction

(c)

Interpretation:

The statistics for the least squares relationship for the equation in option b should be determined.

Concept introduction:

Absorbance increases directly as the concentration of the solution of the sample is increased during the experiment. Also, it increases as the length of the light that is also equal to the width of the cuvette.

Volume of the solution also refers to the concentration of solute present in the given volume of the solution.

Interpretation Introduction

(d)

Interpretation:

The concentration (in ppm) of Chromium in the sample should be determined.

Concept introduction:

Absorbance increases directly as the concentration of the solution of the sample is increased during the experiment. Also, it increases as the length of the light that is also equal to the width of the cuvette.

Volume of the solution also refers to the concentration of solute present in the given volume of the solution.

Interpretation Introduction

(e)

Interpretation:

The standard deviation of the concentration of chromium in the sample should be determined.

Concept introduction:

Absorbance increases directly as the concentration of the solution of the sample is increased during the experiment. Also, it increases as the length of the light that is also equal to the width of the cuvette.

Volume of the solution also refers to the concentration of solute present in the given volume of the solution.

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