Chemical analysis is useful e.g. blood tests - for monitoring general health and diagnosing diseases, also alcohol content of blood. Water companies - purity of the drinking water they provide.
Qualitative analysis tells you what is present (even a trace can be bad)
Quantitative analysis tells you how much is present
Test for Positive Ions using NaOH to give a coloured metal hydroxide precipitate
Add a few drops of NaOH to your solution to form a coloured insoluble hydroxide hopefully!
Calcium - White Copper(II) - Blue Iron (II) - Green Iron (III) - Brown
Aluminium - White. But then dissolves in excess NaOH to become colourless.
Ammonium - No precipate, but gives off amonia when heated. Amonia - damp universal indicator paper goes purple, red litmus paper goes blue, also smell: urine.
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