![]() Test for sulfate ionsĪdd a few drops of dilute hydrochloric acid, then a few drops of barium chloride solution. Confirm that the gas is carbon dioxide - limewater turns milky. Bubbles are produced if carbonate ions are present. Test for carbonate ionsĪdd a few drops of dilute hydrochloric acid. Confirm that the gas is ammonia - damp red litmus paper turns blue. Ammonia gas is produced if ammonium ions are present. White - no change in excess sodium hydroxide solutionĪdd a few drops of dilute sodium hydroxide solution, then warm gently. White - dissolves in excess sodium hydroxide solution Observe and record the colour of any precipitate formed. observe and record the flame colour producedĪdd a few drops of dilute sodium hydroxide solution.put the loop into the edge of the blue flame from a Bunsen burner.dip a clean wire loop into a solid sample of the compound being tested.Repeat any tests that do not get clear results.Ĭarry out a flame test as described earlier: You may need to dissolve a sample of salt in a little distilled water if you are given solids, rather than solutions. ![]()
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