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Joanna van Dyk
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How to make samples of pure dry crystals of a salt. This flowchart will help you to identify the correct method and describes each type of experiment.

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Joanna van Dyk
Created by Joanna van Dyk over 9 years ago
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Making Salts Flow Chart

1/1
Is the salt soluble?
NO

Precipitation
  • Make 2 solutions, each one containing one ion of the salt to be made (use soluble salts!!!)
  • Mix the solutions
  • Filter off the precipitate which is the insoluble salt
  • Wash the residue with distilled water
  • Dry with filter paper or on warm gauze
YES


Is the base soluble?
YES

Titration
  • Add acid via burette to alkali + indicator until neutral (or until temperature stops rising)
  • Measure volume of acid added; throw away solution as it contains the indicator
  • Add same volume of acid to same volume of alkali without indicator
  • Obtain dry salt from solution

Add excess base
  • Add excess base to acid until no more will dissolve (warm the solution if necessary)
  • Filter off excess base
  • Obtain dry salt from the solution

NO
How to Obtain Dry Salt From a Solution
  • Concentrate solution until it becomes fully saturated by evaporating as much water as possible. The solution is saturated when crystals form on a glass rod dipped into it.
  • Allow the solution to cool and salt crystals to form
  • Filter the crystals to remove water
  • Wash crystals with a little water
  • Dry crystals with filter paper or place on a warm gauze.