Making Salts Flow Chart

Joanna van Dyk
Note by Joanna van Dyk, updated more than 1 year ago
Joanna van Dyk
Created by Joanna van Dyk over 5 years ago
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Description

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.

Resource summary

Page 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?

YESTitration 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.

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