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]]>Digestion of precipitation :- Digestion is a process keeping the precipitation within the mother liquor for a certain period of time to encourage densification of nuclei.
During digestion, small particle dissolve in larger one grow
This process help produce larger crystal that are more easily filtered from solution.
IMPURITIES IN PRECIPITATION :-
Co- precipitation :– The simultaneous precipitation of more than one compound from a solution.
Inclusion :- it is crystallographic defect.
Example :- In NaCl crystsl Na is replaced by k produced kcl.
If positive error occur due to inclusion so weight of ppt is increase.
If negative error occur due to inclusion so weight of ppt is decrease.
Occlusion :– occur when foreign ions get trapped in growing crystal
Mechanical Entrapment :- small amount of solution is entrapped.
Both occlusion and Entrapment are at minimum when the rate of ppt is low.
Surface adsorption :- Impurities are adsorption on the surface of ppt.
Post precipitation :- It is the precipitation that occur as a layer upon the already formed precipitate.
Post precipitation always give positive error.
MCQ
1. Impurity are absorbed in surface of the ppt is called
A. Inclusion
B. Mechanical Entrapment
C. Surface adsorption
D. Post precipitation
2. Crystal graphic defect is called as
A. Inclusion
B. Mechanical Entrapment
C. Surface adsorption
D. Post precipitation
3. Which error gives always positive error ?
A. Inclusion
B. Mechanical Entrapment
C. Surface adsorption
D. Post precipitation
4. Inclusion error is give
A. Positive error
B. Negative error
C. A and B
D. None of the above
5. when foreign ions get trapped in growing crystal is called
A. Inclusion
B. Mechanical Entrapment
C. Surface adsorption
D. Occlusion
6. Which sentence is false about heating solution ?
A. Increase solubility of the solution
B. Increase degree of supersaturation.
C. Decrease degree of supersaturation
D. All of the above
7. Which sentence is true about digestion ?
A. It is produced difficult in filtration
B. It is produced small ppt
C. It is produced larger ppt
D. All of the above
Answer key
1. C
2. A
3. D
4. C
5. D
6. B
7. C
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The post Gravimetry Analysis Part-4: Solution based Problems and MCQ with Answers appeared first on Gpatindia: Pharmacy Jobs, Admissions, Scholarships, Conference,Grants, Exam Alerts.
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