TABLE OF CONTENTS | 1. | Define equivalent weight. |
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| 2. | What is the equivalent weight of copper? |
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| 3. | What is chemical displacement? |
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| 4. | Why does iron displace copper in the experiment? |
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| 5. | How can you prepare 0.1 N CuSO 4 solution? |
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| 6. | What is the indicator used in the experiment? |
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| 7. | Name the chemical present in the desiccator. |
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Answers
| 1. | It is the number of parts by weight of a substance that combines with or displaces one part by weight of hydrogen or eight parts by weight of oxygen or 35.5 parts by weight of chlorine. |
| 2. | 63.5. |
| 3. | Displacement of a less active metal (like Cu) by a more active metal (like Fe) in solution is called chemical displacement. |
| 4. | Because iron is placed high above in the spectrochemical series and thus is a more active metal than copper. |
| 5. | By dissolving 0.635 g of CuSO 4 in 100 mL of distilled water. |
| 6. | Freshly prepared starch solution. |
| 7. | CaCl 2. [For more Discussion equations please refer to experiment No. 3] |
Experiment No. 8. To determine the molecular weight of a polystyrene sample by viscometric method.
Theory: The viscosity of a polymer solution is related to the molecular weight, M, of the polymer by the equation:
where ? sp is the specific viscosity of the solution, ? o and ? the viscosities of solvent and solution respectively, C the weight of the polymer (g) in 100 ml of solution, and K and a...
