The requirement of a “Control” sample in this experiment, needs to be explained. Concept introduction: When a material, of which the composition is already known, is used to analyze along with the chemical reaction of a test sample, so that the accuracy of analysis can be compared and evaluated, then such a sample is called a “Control” sample.

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Chapter 9.3, Problem 3E

Interpretation Introduction

Interpretation: The requirement of a “Control” sample in this experiment, needs to be explained.

Concept introduction: When a material, of which the composition is already known, is used to analyze along with the chemical reaction of a test sample, so that the accuracy of analysis can be compared and evaluated, then such a sample is called a “Control” sample.

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