Chemistry – Experimental techniques and chemical analysis - Identification of ions and gases | e-Consult
Experimental techniques and chemical analysis - Identification of ions and gases (1 questions)
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Test 1: Acidification
- To the unknown solution, add a few drops of dilute nitric acid (HNO3) to acidify the solution. This is necessary to prevent the precipitation of other anions.
Test 2: Addition of Barium Nitrate
- Add a few drops of aqueous barium nitrate (Ba(NO3)2) to the acidified solution.
- Observe the solution for the formation of a precipitate.
Observation and Conclusion:
- If a white precipitate of barium sulfate (BaSO4) is formed, it confirms the presence of the sulfate ion. Reaction: Ba2+(aq) + SO42-(aq) → BaSO4(s)
- If no precipitate is formed, the sulfate ion is not present.