ऋणायन पहचान परीक्षण

चयनात्मक रासायनिक अभिक्रियाओं के माध्यम से सामान्य ऋणायनों का पता लगाना

Qualitative Analysis Intermediate (High School) 60 मिनट ~$10.00

उद्देश्य

विशिष्ट अवक्षेपण, अम्ल-अपघटन और रेडॉक्स परीक्षणों का उपयोग करके अज्ञात ऋणायनों की पहचान करें।

पृष्ठभूमि

Anion analysis complements cation identification in classical qualitative analysis. Unlike cations, anions do not follow a single systematic separation scheme. Instead, they are identified through a series of specific tests: chloride with silver nitrate, sulfate with barium chloride, carbonate with acid, and so on. Understanding these tests reinforces knowledge of solubility rules and reaction types.

सुरक्षा चेतावनियाँ

  • AgNO₃ stains skin and clothing permanently
  • Use dilute acids only — concentrated acids can produce toxic gases
  • BaCl₂ is toxic if ingested
  • Dispose of silver waste in designated containers

आवश्यक PPE

goggles gloves lab_coat

सामग्री

  • Unknown anion solution (10 mL)
    Prepared by instructor
  • Silver nitrate (0.1M AgNO₃) (10 mL)
    For halide tests
  • Barium chloride (0.1M BaCl₂) (5 mL)
    For sulfate test
  • Dilute HNO₃ (2M) (10 mL)
    Acidification
  • Dilute H₂SO₄ (1M) (5 mL)
    For carbonate test
  • Limewater (Ca(OH)₂ solution) (10 mL)
    CO₂ detection
  • Brown ring test reagent (FeSO₄) (5 mL)
    For nitrate test

उपकरण

Test tubes (8) Dropper pipettes Bunsen burner Delivery tube Test tube rack

प्रक्रिया

1

Carbonate test: Add dilute H₂SO₄ to 2 mL of unknown solution and pass any gas through limewater. A milky appearance confirms CO₃²⁻.

8 मिनट
2

Sulfate test: Add BaCl₂ solution to 2 mL of unknown acidified with HNO₃. A white precipitate insoluble in acid confirms SO₄²⁻.

8 मिनट
3

Chloride test: Add AgNO₃ to 2 mL of unknown acidified with HNO₃. A white curdy precipitate soluble in NH₄OH confirms Cl⁻.

8 मिनट AgNO₃ stains skin
4

Bromide test: Add AgNO₃ as above. A pale yellow precipitate slightly soluble in NH₄OH confirms Br⁻.

8 मिनट
5

Iodide test: Add AgNO₃ as above. A yellow precipitate insoluble in NH₄OH confirms I⁻.

8 मिनट
6

Nitrate test (brown ring): Layer concentrated H₂SO₄ under a mixture of unknown solution and FeSO₄. A brown ring at the junction confirms NO₃⁻.

10 मिनट Handle concentrated H₂SO₄ with extreme care
7

Record all observations, precipitate colors, and solubility behavior. Cross-reference results to identify the anion(s) present.

10 मिनट

अपेक्षित परिणाम

Each anion produces a characteristic response: carbonates effervesce with acid, sulfates give a white BaSO₄ precipitate, halides give colored AgX precipitates, and nitrates produce a brown ring.

सफाई

Collect silver-containing waste separately. Neutralize acid waste before disposal. Rinse all glassware thoroughly.

विवरण

श्रेणी
Qualitative Analysis
कठिनाई
Intermediate (High School)
अवधि
60 मिनट
अनुमानित लागत
$10.00
चरण
7
सामग्री
7

अधिक प्रयोग

pH संकेतक इंद्रधनुष 45 min अज्ञात पदार्थ पहचान चुनौती 75 min अवक्षेपण द्वारा धनायन पहचान 90 min कार्बोहाइड्रेट के लिए स्टार्च-आयोडीन परीक्षण 30 min ज्वाला उत्सर्जन स्पेक्ट्रोस्कोपी 60 min धातु आयनों के लिए बोरेक्स मोती परीक्षण 45 min पादप वर्णकों का क्रोमैटोग्राफी 60 min साबुन विलयन के साथ कठोर जल परीक्षण 40 min हैलोजन के लिए बेल्स्टीन परीक्षण 25 min

Frequently Asked Questions

What is the objective of ऋणायन पहचान परीक्षण?
विशिष्ट अवक्षेपण, अम्ल-अपघटन और रेडॉक्स परीक्षणों का उपयोग करके अज्ञात ऋणायनों की पहचान करें।
How difficult is ऋणायन पहचान परीक्षण?
This experiment is rated as Intermediate (High School). It takes approximately 60 minutes to complete.
What safety precautions are needed for ऋणायन पहचान परीक्षण?
Key safety precautions include: AgNO₃ stains skin and clothing permanently; Use dilute acids only — concentrated acids can produce toxic gases; BaCl₂ is toxic if ingested.
What materials are needed for ऋणायन पहचान परीक्षण?
The main materials required are: Unknown anion solution, Silver nitrate (0.1M AgNO₃), Barium chloride (0.1M BaCl₂), Dilute HNO₃ (2M), Dilute H₂SO₄ (1M).
What results should I expect from ऋणायन पहचान परीक्षण?
Each anion produces a characteristic response: carbonates effervesce with acid, sulfates give a white BaSO₄ precipitate, halides give colored AgX precipitates, and nitrates produce a brown ring.