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Qualitative Analysis (a) Three solids, A, B, and C, are analysed - Edexcel - GCSE Chemistry - Question 2 - 2014 - Paper 1
Question 2
Qualitative Analysis (a) Three solids, A, B, and C, are analysed. (i) Solid A is potassium iodide. A small amount of solid A dissolved in water to form a solution... show full transcript
Worked Solution & Example Answer:Qualitative Analysis (a) Three solids, A, B, and C, are analysed - Edexcel - GCSE Chemistry - Question 2 - 2014 - Paper 1
Step 1
Solid A is potassium iodide.
Answer
To test for iodide ions in the solution of solid A, add a few drops of nitric acid to the solution and then add silver nitrate solution. A positive test will be indicated by the formation of a yellow precipitate, which confirms the presence of iodide ions.
Step 2
Solid B is ammonium chloride.
Answer
To test for ammonium ions in solid B, add a small amount of sodium hydroxide solution to the solid and warm gently. Then, expose the gas produced to moist red litmus paper. If ammonium ions are present, the red litmus paper will turn blue, indicating the presence of ammonia gas.
Step 3