This question is about ion testing - AQA - A-Level Chemistry - Question 8 - 2017 - Paper 1
Question 8
This question is about ion testing.
08.1 Describe how a student could distinguish between aqueous solutions of potassium nitrate, KNO₃, and potassium sulfate, K₂SO₄... show full transcript
Worked Solution & Example Answer:This question is about ion testing - AQA - A-Level Chemistry - Question 8 - 2017 - Paper 1
Step 1
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Answer
Add sodium hydroxide (NaOH) solution to both test tubes.
Step 2
Observation with KNO₃(aq)
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Answer
There will be no visible precipitate, resulting in a colorless solution.
Step 3
Observation with K₂SO₄(aq)
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Answer
There will also be no visible precipitate, resulting in a colorless solution.
Step 4
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Answer
Add sodium hydroxide (NaOH) solution to both MgCl₂ and AlCl₃ solutions.
Step 5
Observation with MgCl₂(aq)
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A white precipitate forms, as Mg(OH)₂ is produced.
Step 6
Observation with AlCl₃(aq)
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A white precipitate forms, and effervescence may be observed, indicating the presence of Al(OH)₃.
