Gravimetric Analysis
In gravimetric analysis precision improves by:
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More practical chemistry Practice Questions
In gravimetric estimation of chloride, the precipitate formed is:
In gravimetric estimation of chloride, the precipitate formed is:
Repeated measurements close together but deviating from true value show:
Repeated measurements close together but deviating from true value show:
Phenolphthalein is suitable indicator for titration of:
Phenolphthalein is suitable indicator for titration of:
Mixture of 0.020 mol NaOH and 0.015 mol H2SO4 reacts (complete neutralization). Moles of salt formed...
Mixture of 0.020 mol NaOH and 0.015 mol H2SO4 reacts (complete neutralization). Moles of salt formed...
Characteristic violet flame indicates presence of:
Characteristic violet flame indicates presence of:
Black precipitate formed with H2S in acidic medium indicates:
Black precipitate formed with H2S in acidic medium indicates:
At titration endpoint, indicator color change signifies:
At titration endpoint, indicator color change signifies:
KMnO4 acts as self-indicator because:
KMnO4 acts as self-indicator because:
Sulphate ion confirmed by formation of white precipitate with:
Sulphate ion confirmed by formation of white precipitate with:
Chloride ion gives curdy white precipitate with:
Chloride ion gives curdy white precipitate with:
EDTA titration of Ca2+ requires buffer to maintain pH around:
EDTA titration of Ca2+ requires buffer to maintain pH around:
Indicator error minimized by selecting indicator whose transition range:
Indicator error minimized by selecting indicator whose transition range:
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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