Gravimetric Analysis
Hardchemistry
In gravimetric analysis precision improves by:
Select the correct option:
Solution
Incorrect! Answer:
Careful washing & drying to constant mass
- Definition: Gravimetric analysis involves determining the amount of a substance by converting it into a solid of known composition and weighing it.
- Washing: Critical to remove any co-precipitated impurities or mother liquor that would add false mass.
- Drying: The precipitate must be heated to remove all moisture.
- Constant Mass: This means heating and weighing the sample repeatedly until the mass no longer changes by more than a specified threshold (e.g.,0.0002 g). This ensures the substance is pure and completely dry for accurate calculation.
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About This Question
- Subject
- chemistry
- Chapter
- practical chemistry
- Topic
- gravimetric analysis
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
Careful washing & drying to constant mass
- Definition: Gravimetric analysis involves determining the amount of a substance by converting it into a solid of known composition and weighing it.
- Washing: Critical to remove any co-precipitated impurities or mother liquor that would add false mass.
- Drying: The precipitate must be heated to remove all moisture.
- Constant Mass: This means heating and weighing the sample repeatedly until the mass no longer changes by more than a specified threshold (e.g.,0.0002 g). This ensures the substance is pure and completely dry for accurate calculation.
This hard difficulty chemistry question is from the chapter practical chemistry, covering the topic of gravimetric analysis. It appeared in the 2025 exam.
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