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Qualitative analysis

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QUALITATIVE ANALYSIS qualitative analysis is a branch of chemistry that deals with the identification of elements or grouping of elements present in a sample. often a systematic analysis must be made in order for all its constituents to be identified. identification can be performed for: - gases cations anions 1. identification of gases observations for test of gases a) effervescence (if applicable) → bubbles are seen in the solution b) colour and odour of the gas c) observations from tests NOTE 1. start the test by observing the colour and odour of the gas 2. perform a litmus test, wooden splint, limewater and acidified potassium manganate (VII) test for relevant gas. COMPOUNDS SOLUBLLE/INSOLUBLE EXCEPTIONS all Group 1 metals compounds soluble - all ammonium compounds soluble - all nitrates compounds soluble - all sulfates compounds soluble except: - all chlorides compound soluble except: - all carbonate compounds insoluble insoluble Lead (II) chloride Silver chloride except: - all oxides and hydroxides Calcium sulfate Lead (II) sulfate Barium sulfate Group 1 metal carbonates & ammonium carbonate except: - Group 1 metal oxides/hydroxides barium oxide/hydroxide aqueous ammonia Calcium oxide/hydroxide are sparingly soluble. test and observations for gases gas character test istics chemical reaction (equation) that produces gas observation hydrogen colourless place a lighted ; splint at the odourless mouth of the test tube 2HCl (aq) + M ...
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