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Volumetric Analysis (Titration) | Week 13 Topics1 Quiz
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Heat of Neutralization & Redox Titrations | Week 22 Topics1 Quiz
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Test for Common Gases | Week 32 Topics1 Quiz
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Qualitative Analysis I | Week 43 Topics1 Quiz
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Qualitative Analysis II | Week 52 Topics1 Quiz
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Qualitative Analysis III | Week 63 Topics1 Quiz
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Qualitative Analysis IV - Anions | Week 71 Topic1 Quiz
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Test for Fat and Oil; Protein; Starch | Week 83 Topics1 Quiz
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Petroleum I | Week 94 Topics1 Quiz
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Petroleum II | Week 105 Topics1 Quiz
Lesson Progress
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Topic Content:
- Tests for Reducing Sugar: e.g. Glucose, Fructose, Lactose and Maltose
- Tests for Fat and Oil
Tests for Reducing Sugar: e.g. Glucose, Fructose, Lactose and Maltose
| Test | Observation | Inference |
| Few drops of the sample + Fehling’s solution + warming | Solution gives a yellow precipitate, which turns brick-red on warming | Reducing sugar is present |
| Few drops of the sample + Benedict’s solution + warming | Solution gives an orange-red or yellow precipitate | Reducing sugar is present |
Non-reducing sugars do not react with Fehling’s or Benedict’s solution. Therefore they do not give any precipitate with these reagents.
Tests for Fat and Oil
| Test | Observation | Inference |
| 2 cm3 of sample + water + (3 – 5 drops of) Sudan(III) stain | Red stain is formed | Sample is melted fat or oil |
| Few drops of sample on a piece of white paper or filter paper | Translucent spot (grease spot) is observed on the paper | Sample is melted fat or oil |
Responses