Page |97 5. A student analyzed an unknown sample that contained a single anion.
ID: 554436 • Letter: P
Question
Page |97 5. A student analyzed an unknown sample that contained a single anion. The sample gave a yellow precipitate upon addition of a solution of AgNOs which did not dissolve in ammonia. Which anion is present in the unknown solution? Write the corresponding net ionic equation. 6. A student analyzed an unknown sample that contained a single anion. The sample gave a white precipitate upon addition of a solution of AgNOs which dissolved in ammonia. Which anion is present in the unknown solution? Write the corresponding net ionic equation. 7. lodine (2) and bromine (Br2) are soluble in mineral oil and slightly soluble in water. Why? Suggest another solvent, hexane or alcohol, which can be used instead of mineral oil? Explain. CH CH2CH2CHzCHzCHs Hexane AlcoholExplanation / Answer
Ans 5 :
Silver halides are insoluble in water. Different halides give different colours when precipitated with silver nitrate solution.
The iodide ions when precipitate forms silver iodide which is yellow in colour.
This precipitate is insoluble in ammonia .
The net ionic equation is given as :
Ag+(aq) + I-(aq) = AgI(s)
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