Nitric acid and its salts contain the nitrite ion (NO₂⁻) - Leaving Cert Chemistry - Question (d) - 2014
Question (d)
Nitric acid and its salts contain the nitrite ion (NO₂⁻).
Describe in detail how you could test for the presence of the nitrate anion in aqueous solution.
Worked Solution & Example Answer:Nitric acid and its salts contain the nitrite ion (NO₂⁻) - Leaving Cert Chemistry - Question (d) - 2014
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Answer
Begin the test by adding a few drops of freshly-prepared iron(II) sulfate solution to a clean test tube. This compound will facilitate the formation of a distinct reaction product if nitrate ions are present.
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Answer
Carefully trickle concentrated sulfuric acid down the side of the test tube containing the iron(II) sulfate solution. Keep the test tube in a slanted position to allow the acid to form a distinct layer above the iron(II) sulfate solution without mixing them.
Step 3
Observe results for formation of brown ring
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Answer
After adding the sulfuric acid, observe the junction of the two liquids. A brown ring should form at the interface if the nitrate ions are present. This reaction indicates the successful identification of nitrate anions.
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