BACKGROUND
Surface area
The surface area of the powder can be calculated by using particle size data. This specific surface area may be defined as the surface area per unit weight (SW), or per unit volume (SV). The particle having large surface area are good absorbent for solid and gases. The diameter measured by this method is surface diameter.1-3
Aim: To determine specific surface area of talc by adsorption method.
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REQUIREMENTS
Chemical:
- Distilled water,
- Talc,
- Stearic acid,
- 0.1N NaOH
- Phenolphthalein
Apparatus:
- Electronic balance,
- Conical flask,
- Burette,
- Pipette
PROCEDURE
100 ml of 1.0% stearic acid solution was prepared in neutralized methanol. Around 5 g of talc was accurately weighed and taken in a stoppered conical flask. 50 ml of 1.0% stearic acid in neutralized methanol was added to the conical flask containing talc.
The mixture was shaken for 1 hr and filtered through filter.N10 ml of filtrate was pipette out and titrated against 0.1 N NaOH solutions.
| Sl. No. | Mean Volume of 0.1 N NaOH (ml) for 10 ml filtrate | Concentration of stearic acid | Mean Volume of 0.1 N NaOH (ml) for 10 ml of blank | Concentration of stearic acid |
| 1 | ||||
| 2 | ||||
| 3 | ||||
| 4 | ||||
| 5 | ||||
| 6 |
CONCLUSION
The specific surface area of talc was found to be ____ sq.cm./g.
REFERENCES
- More HN, Hajare AA. Practical Physical Pharmacy. Career Publications. 2010: 131-133.
- Gaud RS, Gupta GD. Practical Physical Pharmacy. CBS Publisher and Distributors. 2009: 40-42.
- Mohanta GP. Physical Pharmacy Practical Text, Pharma Book Syndicate. 2006: 56-58.
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