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SS3: CHEMISTRY - 1ST TERM

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  1. Volumetric Analysis (Titration) | Week 1
    3 Topics
    |
    1 Quiz
  2. Heat of Neutralization & Redox Titrations | Week 2
    2 Topics
    |
    1 Quiz
  3. Test for Common Gases | Week 3
    2 Topics
    |
    1 Quiz
  4. Qualitative Analysis I | Week 4
    3 Topics
    |
    1 Quiz
  5. Qualitative Analysis II | Week 5
    2 Topics
    |
    1 Quiz
  6. Qualitative Analysis III | Week 6
    3 Topics
    |
    1 Quiz
  7. Qualitative Analysis IV - Anions | Week 7
    1 Topic
    |
    1 Quiz
  8. Test for Fat and Oil; Protein; Starch | Week 8
    3 Topics
    |
    1 Quiz
  9. Petroleum I | Week 9
    4 Topics
    |
    1 Quiz
  10. Petroleum II | Week 10
    5 Topics
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    1 Quiz

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Topic Content:

  • Theory Questions & Answers – Qualitative Analysis III

Theory Questions – Qualitative Analysis III:

1. Name three pairs of reagents used in the identification of anions.

2. Give a laboratory test for the identification of each of the following anions.

(a). trioxonitrate(V) ion

(b). tetraoxosulphate(VI) ion

(c). chloride ion

(d). sulphide ion

 

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Theory Questions & Answers -Qualitative Analysis III

1. Name three pairs of reagents used in the identification of anions.

Answer:

– BaCl2(aq) + dil HCl(aq)

– Freshly prepared FeSO4(aq) + conc. H2SO4(aq)

– dilute HNO3(aq) + AgNO3(aq)

 

2. Give a laboratory test for the identification of each of the following anions.

a. Trioxonitrate(V) ion (NO3–)

Answer:

Brown ring Test

Test Observation Inference
Sample solution + freshly prepared FeSO4(aq) + conc H2SO4 solution (in drops) down the side of the test tube while held in a slanting position Brown ring is formed at the liquid junction NO3–confirmed

 

b. Tetraoxosulphate(VI) ion (SO4–)

Answer:

Test Observation Inference
Sample solution
+ HCl(aq)		 No visible reaction
+ BaCl2(aq) White precipitate formed
Precipitate is insoluble		 SO42- present

 

c. Chloride Ion

Answer:

Test Observation Inference
Sample solution
+ AgNO3(aq)		 White precipitate formed SO32-, CO32-, Cl–
White precipitate formed or S– present
+ dil HNO3(aq) in excess White precipitate dissolves in excess NH3(aq) Cl– present

 

d. Sulphide Ion (S2-)

Answer:

Test Observation Inference
Sample solution + Pb(CH3COO)2(aq) Or Pb(NO3)2(aq) + Warming Black precipitate of lead(II) sulphide is formed S2- Confirmed

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