chemecal analasis

  • Created by: akoo :)
  • Created on: 17-12-12 21:54

just a few notes on chemical analysis

Testing for Cations

Cations are positively charged (+) ions. There are 2 basic tests for them:

  • Flame test
  • Adding NaOH (aq) to solution of ionic compound

The flame test involves a clean nichrome wire first being dipped into a solution of Hydrochloric acid. This is then dipped into the solid powdered compound of the metal being tested. This is then held over a Bunsen Burner and the flame colour is observed.

The following results are gained for each ion:

  • Na+ - Yellow flame
  • K+ - Lilac (light purple) flame
  • Ca2+ - Red flame
  • Cu2+ - Blue / green flame

The second test of adding NaOH (sodium hydroxide) gives a coloured…


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