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Questions and Answers
What distinguishes the Group 1 Anions from other groups?
What distinguishes the Group 1 Anions from other groups?
What is indicated when effervescence is observed in the test described?
What is indicated when effervescence is observed in the test described?
Which ion is confirmed to be present when a brown color is produced after addition of Kl?
Which ion is confirmed to be present when a brown color is produced after addition of Kl?
What does the formation of a yellow precipitate after adding ammonium molybdate confirm?
What does the formation of a yellow precipitate after adding ammonium molybdate confirm?
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What indicates the presence of Oxalate ion in the test mentioned?
What indicates the presence of Oxalate ion in the test mentioned?
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What is confirmed when no yellow precipitate is formed in the second portion involving the Centrifugate?
What is confirmed when no yellow precipitate is formed in the second portion involving the Centrifugate?
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What is the purpose of adding KCIO₂ in an acid solution in procedure #1?
What is the purpose of adding KCIO₂ in an acid solution in procedure #1?
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Why is a confirmatory test important in the qualitative analysis of Group 1 Anions?
Why is a confirmatory test important in the qualitative analysis of Group 1 Anions?
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What is the purpose of thoroughly washing the residue in this test?
What is the purpose of thoroughly washing the residue in this test?
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Which reagent is used to confirm the presence of arsenite ion?
Which reagent is used to confirm the presence of arsenite ion?
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What compound is formed when fluoride ion reacts with CC₁₁₂?
What compound is formed when fluoride ion reacts with CC₁₁₂?
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Why is it necessary to oxidize sulfate, sulfide, and thiosulfate ions in procedure #1?
Why is it necessary to oxidize sulfate, sulfide, and thiosulfate ions in procedure #1?
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Study Notes
Group 1 Anions
- The Group 1 Anions consist of Carbonate (CO2-), Sulfite (SO32-), Oxalate (C₂O2-), Fluoride (F-), Arsenite (ASO3-), Arsenate (AsO3-), and Phosphate (PO4³-).
Characteristics of Group 1 Anions
- The calcium salts of these anions are insoluble in neutral or slightly basic solution.
Effervescence
- Effervescence is the release of a gas from a solid or liquid, forming bubbles in a liquid medium, indicating a chemical change.
- In the context of Group 1 Anions, effervescence refers to the release of carbon dioxide gas.
Identification of Group 1 Anions
- Sulfite ion (SO32-): forms a white precipitate with Barium sulfate (BaSO4).
- Arsenite ion (ASO3-): forms a yellow precipitate with Arsenic trisulfide (As₂S₃).
- Phosphate ion (PO4³-): forms a yellow precipitate with Ammonium phosphomolybdate ((NH4)3PO4.12MoO3).
- Oxalate ion (C₂O2-): presence confirmed by the disappearance of a pink color with Manganese ion (Mn²+).
- Fluoride ion (F-): presence confirmed by the etching of glass with Silicon tetrafluoride (SiF₄).
Importance of Confirmatory Tests
- Confirmatory tests are essential to identify individual ions present in a given unknown sample.
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Description
Test your knowledge about the Group 1 Anions - Carbonate, Sulfite, Oxalate, Fluoride, Arsenite, Arsenate, and Phosphate. Learn about their properties and how to differentiate them from other anion groups.
