Describe a test for the presence of chloride ion (Cl-) in water. - Leaving Cert Chemistry - Question d - 2023
Question d
Describe a test for the presence of chloride ion (Cl-) in water.
Worked Solution & Example Answer:Describe a test for the presence of chloride ion (Cl-) in water. - Leaving Cert Chemistry - Question d - 2023
Step 1
Add silver nitrate solution (AgNO₃)
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Answer
To test for the presence of chloride ions in water, first add a few drops of silver nitrate solution (AgNO₃) to the water sample.
Step 2
Dilute with nitric acid
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Next, dilute the solution with nitric acid (HNO₃). This step is crucial to remove any other interfering ions that could lead to false results.
Step 3
Observe for white precipitate formation
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Answer
Finally, observe the solution for the formation of a white precipitate, which indicates the presence of chloride ions. The white precipitate formed is silver chloride (AgCl), confirming the presence of Cl- in the sample.
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