Podcast
Questions and Answers
Anion: Chloride (Cl⁻) Test: Acidify the solution with dilute nitric acid (HNO₃). Add a few drops of aqueous silver nitrate (AgNO₃). Positive Result: White precipitate of silver ______ (AgCl).
Anion: Chloride (Cl⁻) Test: Acidify the solution with dilute nitric acid (HNO₃). Add a few drops of aqueous silver nitrate (AgNO₃). Positive Result: White precipitate of silver ______ (AgCl).
chloride
Anion: Bromide (Br⁻) Test: Follow steps 1 and 2 from Chloride testing. Positive Result: Pale cream precipitate of silver ______ (AgBr).
Anion: Bromide (Br⁻) Test: Follow steps 1 and 2 from Chloride testing. Positive Result: Pale cream precipitate of silver ______ (AgBr).
bromide
Anion: Iodide (I⁻) Test: Follow steps 1 and 2 from Chloride testing. Positive Result: Yellow precipitate of silver ______ (AgI).
Anion: Iodide (I⁻) Test: Follow steps 1 and 2 from Chloride testing. Positive Result: Yellow precipitate of silver ______ (AgI).
iodide
Anion: Sulfate (SO₄²⁻) Test: Add a few drops of barium chloride (BaCl₂) or barium nitrate (BaNO₃) solution to the test solution. Positive Result: White precipitate of barium ______ (BaSO₄).
Anion: Sulfate (SO₄²⁻) Test: Add a few drops of barium chloride (BaCl₂) or barium nitrate (BaNO₃) solution to the test solution. Positive Result: White precipitate of barium ______ (BaSO₄).
Anion: Carbonate (CO₃²⁻) Test: Add a few drops of dilute hydrochloric acid (HCl) to the test solution. Positive Result: Brisk effervescence of carbon dioxide gas (______) is observed.
Anion: Carbonate (CO₃²⁻) Test: Add a few drops of dilute hydrochloric acid (HCl) to the test solution. Positive Result: Brisk effervescence of carbon dioxide gas (______) is observed.
Anion: Nitrate (NO₃⁻) Test: Add a small piece of aluminium foil to the test solution and make the mixture alkaline with sodium hydroxide (NaOH). Warm gently. Positive Result: ______ is observed.
Anion: Nitrate (NO₃⁻) Test: Add a small piece of aluminium foil to the test solution and make the mixture alkaline with sodium hydroxide (NaOH). Warm gently. Positive Result: ______ is observed.
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Study Notes
Anion Identification Tests
Chloride (Cl⁻)
- Test: Acidify the solution with dilute nitric acid (HNO₃) and add a few drops of aqueous silver nitrate (AgNO₃)
- Positive Result: White precipitate of silver chloride (AgCl)
- Interfering Anions: Bromide (Br⁻) and Iodide (I⁻) (distinguished by precipitate color)
Bromide (Br⁻)
- Test: Follow steps 1 and 2 from Chloride testing
- Positive Result: Pale cream precipitate of silver bromide (AgBr)
- Interfering Anions: Iodide (I⁻) (distinguished by precipitate color)
Iodide (I⁻)
- Test: Follow steps 1 and 2 from Chloride testing
- Positive Result: Yellow precipitate of silver iodide (AgI)
Sulfate (SO₄²⁻)
- Test: Add a few drops of barium chloride (BaCl₂) or barium nitrate (BaNO₃) solution to the test solution
- Positive Result: White precipitate of barium sulfate (BaSO₄)
- Solubility: Insoluble in water and dilute acids
Carbonate (CO₃²⁻)
- Test: Add a few drops of dilute hydrochloric acid (HCl) to the test solution
- Positive Result: Brisk effervescence of carbon dioxide gas (CO₂) is observed
Nitrate (NO₃⁻)
- Test: Add a small piece of aluminium foil to the test solution and make the mixture alkaline with sodium hydroxide (NaOH)
- Test: Warm gently
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