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2 (a) Three solids, A, B, and C, are analysed - Edexcel - GCSE Chemistry - Question 2 - 2014 - Paper 1
Question 2
2 (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. Describe the test... show full transcript
Worked Solution & Example Answer:2 (a) Three solids, A, B, and C, are analysed - Edexcel - GCSE Chemistry - Question 2 - 2014 - Paper 1
Step 1
Describe the test to show that the solution of A contains iodide ions.
Answer
To test for iodide ions in the solution of A, add dilute nitric acid followed by a few drops of silver nitrate solution. This will produce a yellow precipitate of silver iodide, indicating the presence of iodide ions.
Step 2
Describe the test to show that solid B contains ammonium ions.
Answer
To test for ammonium ions in solid B, add sodium hydroxide solution to a sample of solid B and warm the mixture. Then, use damp red litmus paper to test the gas released. If ammonia is present, the litmus paper will turn blue, confirming the presence of ammonium ions.
Step 3