You are asked to test a white crystalline solid to confirm that it is lithium chloride (LiCl) - Leaving Cert Chemistry - Question a - 2014
Question a
You are asked to test a white crystalline solid to confirm that it is lithium chloride (LiCl).
(i) Describe how to carry out a flame test on the solid. (12)
(ii) W... show full transcript
Worked Solution & Example Answer:You are asked to test a white crystalline solid to confirm that it is lithium chloride (LiCl) - Leaving Cert Chemistry - Question a - 2014
Step 1
Describe how to carry out a flame test on the solid.
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Answer
To carry out a flame test for the white crystalline solid:
Prepare the Equipment: Use a platinum (nichrome) wire or a soaked wooden splint for testing.
Sample Preparation: Dip the wire or splint into the crystalline solid (lithium chloride).
Conduct the Test: Hold the dipped wire in the flame of a Bunsen burner.
Observation: Observe the color of the flame.
Recording Results: Record the color noted during the test to identify the presence of lithium.
Step 2
What reagent is used to test for the chloride ion?
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Answer
The reagent used to test for the chloride ion is silver nitrate (AgNO₃).
Step 3
Copy the table into your answer book and complete it with the expected results of the tests.
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Answer
Solid
Flame Test Result
Chloride Test Observation
LiCl
Crimson (Red)
White Precipitate
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