The post Gravimetry Analysis Part 2: Steps of Gravimetric Precipitation and Question and Answers appeared first on Gpatindia: Pharmacy Jobs, Admissions, Scholarships, Conference,Grants, Exam Alerts.
]]>• SAMPLE SOLUTION :- sample solution is prepared generally dilute solution is preferred. Adjustment of the volume, PH, and getting the desired property of the solution.
• PRECIPITATION FORMATION :-
Precipitation formation has three stages 1. Super saturation :-
It is defined as solution that contain more of the disolved material than could be dissolved by the solvent under normal circumstances.
It is first step of preparation process. After addition of first drop of precipitating agent supersaturation is occur.
Solute/ Analyte conc >> Equilibrium solubility.
2. Nucleation :-
Nucleation process is starting after supersaturation.
In this step aggregation of ions/ element to form sub – micro nuclei.
3. Precipitate particle growth :-
Sample amount of analyte will be added to nuclei that leading to particle growth.
FACTOR DETERMINING SUCCESSFUL PRECIPITATION :-
CONTAMINATION OF PRECIPITATES :-
1. Post Precipitation :- Deposition of impurity after PPT.
Ex. Ca- oxalate ppt in presence of Mg ion. After some time, Mg oxalate formed deposit on Ca- oxalate surface.
2. Co- Precipitation :- when two or more than two ion are simultaneously precipitated out in the sample solution, then the condition is known as the co Precipitation.
• Digestion :-
MCQ
1. Which sentence is false about preparation of the solution ?
A. It has required PH.
B. It is diluted solution.
C. It is concentrated solution.
D. All of the above
2. What is a supersaturation ?
A. Solution containing low amount of solute
B. Solution containing equilibrium amount of solute
C. Solution containing more amount of solute than normal circumstances.
D. None of this.
3. In which step, ions or element are aggregated in Gravimetric analysis?
A. Supersaturation
B. Nucleation
C. Particle growth
D. None of the above
4. For gravimetric analysis Rate of Nucleation is fast in?
A. Small ppt
B. Large ppt
C. A and B
D. None of the above
5. When more than two ions in solution and simultaneously second ion is also precipitated it is called a
A. Co precipitation
B. Post precipitation
C. A and B
D. None of the above
6. OSTWALD RIPENING is
A. Re precipitation
B. Dissolved small ppt
C. Produced larger ppt
D. All of the above
Answer key
1. C
2. C
3. B
4. A
5. A
6. D
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The post Gravimetry Analysis Part 2: Steps of Gravimetric Precipitation and Question and Answers appeared first on Gpatindia: Pharmacy Jobs, Admissions, Scholarships, Conference,Grants, Exam Alerts.
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