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Describe a test for the presence of chloride ion (Cl-) in water. - Leaving Cert Chemistry - Question d - 2023

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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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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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