Recrystallization Test

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In this activity, learners recrystallize substances from solutions and make observations about the resulting crystals. This test can help further identify the unknown. Two different methods for recrystallization are provided in this activity: an overnight method and a 1-hour to 3-hour method. This is a follow-up activity to the "Developing Tests to Distinguish Between Similar-Looking Liquids" activity from the same resource (see related resources). [Activity is publicly available through a web crawler capture on Archive.org. Activity write-up only, images are unavailable.]

Quick Guide

Preparation Time:
10 to 30 minutes
Learning Time:
4 to 24 hours
Estimated Materials Cost:
$1 - $5 per group of students
Age Range:
Ages 8 - 14
Resource Types:
Activity, Experiment/Lab Activity
Language:
English

Materials List (per group of students)

  • Solutions of salt, sugar, MSG, Epsom salt, and an unknown
  • 5 labeled cups
  • Permanent marker
  • Cotton swabs
  • Student Activity Sheet

Keywords

Subjects

  • Mathematics
    • Data Analysis and Probability
      • Data Analysis
  • Physical Sciences
    • Chemistry
      • Solutions
    • States of Matter
      • Solids
  • The Nature of Science
    • The Scientific Process
      • Conducting Investigations
      • Gathering Data

Audience

To use this activity, learners need to:

  • see
  • touch

Learning styles supported:

  • Involves hands-on or lab activities

Other

Components that are part of this resource:

This resource is part of:

Access Rights:

  • Free access

By:

  • Kessler, James H. ; Galvan, Patricia M.

Rights:

  • All rights reserved, American Chemical Society, 2007