Qualitative analysis

Essay by car1car2High School, 11th gradeA-, May 2006

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Purpose:

To testing of a substance or mixture and determine its chemical constituents, to develop a systematic scheme by using the material given to us to identify the unknown solutions.

Material:

Copper(II)Sulfate (0.1mol/L) Ammonium sulfate (0.1mol/L)

Copper(II) nitrate (0.1mol/L) Zinc sulfate (0.1mol/L)

Barium chloride (0.1mol/L) 4 unknown solutions

Sodium Carbonate (0.1mol/L)

Procedure:

1. 2 drops of CuSO4 was added with 2 drops of each of BaCl2, ZnSO4, (NH4)2SO4 and NaCO3 in separate test tubes.

2. 2 drops of Cu(NO3)2 was added to 2 drops of each of BaCl2, ZnSO4 and (NH4)2SO4 in separate test tubes.

3. 2 drops of Na2CO3 was added with 2 drops of each of BaCl2, ZnSO4, (NH4)2SO4 and NaCO3 in separate test tubes.

4. 2 drops of unknown solution # 1 was added with 2 drops of each of CuSO4, Cu(NO3)2 and NaCO3 in separate test tubes.

5. 2 drops of unknown solution # 2 was added with 2 drops of each of CuSO4, Cu(NO3)2 and NaCO3 in separate test tubes.

6. 2 drops of unknown solution # 3 was added with 2 drops of each of CuSO4, Cu(NO3)2 and NaCO3 in separate test tubes.

7. 2 drops of unknown solution # 4 was added with 2 drops of each of CuSO4, Cu(NO3)2 and NaCO3 in separate test tubes.

Conclusion:

Qualitative analysis is to describe a quality or change in matter that has no numerical value expressed. E.g.) changing in colour throw reaction, the conductivity test of electrolytes. We conclude that qualitative analysis is often used for diagnostic testing. Also we knows how could we determine which ions were present by using the qualitative analysis. We conclude that it is hard to identify an ion in a solution unless it forms a compound with low solubility to form a precipitate and recognize that the absence of...