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The Analysis of Alum

Figure from experiment 15B from Advanced Chemistry with Vernier

Introduction

After a compound has been synthesized, tests should be carried out to verify that the compound formed is indeed the compound desired. There are a number of tests that can be performed to verify that the compound is the one desired. In Experiment 15A, you prepared alum crystals, KAl(SO4)2•12H2O. In Experiment 15B, you will conduct a series of tests to determine if your crystals are really alum.

The first test is to find the melting temperature of the compound and compare this value with the accepted (published) value for alum (92.5°C). The second test determines the water of hydration present in the alum crystals. The third test is a chemical test to determine the percent sulfate in your sample of alum.

Objectives

In this experiment, you will

  • Determine the melting temperature of a sample of alum.
  • Determine the water of hydration of a sample of alum.
  • Determine the percent sulfate of a sample of alum.
  • Verify the chemical formula of a sample of alum.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Option 1

Option 2

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Advanced Chemistry with Vernier »

Experiment 15B from Advanced Chemistry with Vernier Lab Book

<i>Advanced Chemistry with Vernier</i> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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