Ostwald viscometer (experiment pdf), experiment to determine viscosity of liquid pdf, determine the viscosity of liquid by viscometer, determination of viscosity using ostwald viscometer viva questions, ostwald viscometer experiment procedure, viscosity of a liquid and determination of coefficient of viscosity using ostwald viscometer, determination of viscosity of liquids
BACKGROUND
Ostwald viscometer is used to determine viscosity of Newtonian fluid. When the liquid flow by gravity time required for the liquid to pass between two mark A and B through the capillary tube is determined. The time of flow of liquid under test is compared with time required for the liquid of known viscosity, the viscosity of unknown liquid.1-3
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η1 can be determine using following equation.
η1=ʆ1t1/ ʆ2t2 X η2
ʆ1=Density of unknown liquid
t1 =Time of flow of unknown liquid
ʆ2 =Density of standard liquid
t2 =Time of flow of standard liquid
η2=Viscosity of standard liquid
Aim: To determine the viscosity of liquid using Ostwald viscometer.
REQUIREMENTS
Chemical: Distilled water, Ethanol, Acetone.
Apparatus: Ostwald viscometer, Electronic balance, Stop watch.
PROCEDURE
The viscometer was mounted vertical position on a suitable stand. Water was filled in to the viscometer up to mark A. The time was counted for water to flow from mark A to mark B. The same procedure was repeated for the test liquid by using the above formula viscosity of the test liquid could be determined.
LIQUID | TIME OF FLOW | DENSITY | VISCOSITY | |||
I | II | III | MEAN | |||
WATER | ||||||
ETHANOL | ||||||
ACETONE | ||||||
TOLUENE |
CONCLUSION
Viscosity of the unknown liquid is __________ found to be ________is determined by using Ostwald viscometer.
Also Read:
- Determination of pKa value by Half Neutralization/ Henderson Hasselbalch equation
- Determination of Freundlich and Langmuir Constants using Activated charcoal
- Determination of stability constant and donor acceptor ratio of PABA-Caffeine complex by solubility method
- Partition co-efficient of Iodine in Distilled water and Carbon tetrachloride
- Partition co-efficient of benzoic acid in benzene and water
- Determination of surface tension by drop weight method
- Preparation and stability studies of emulsions
- Determination of particle size by Sieve analysis
- Determination of interfacial tension by drop weight method
REFERENCES
- More HN, Hajare AA. Practical Physical Pharmacy. Career Publications. 2010:141-142.
- Gaud RS, Gupta GD. Practical Physical Pharmacy. CBS Publisher and Distributors. 2009:56-57.
- Mohanta GP. Physical Pharmacy Practical Text, Pharma Book Syndicate. 2006: 63-64.
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FAQs
The viscometer was mounted vertical position on a suitable stand. Water was filled in to the viscometer up to mark A. The time was counted for water to flow from mark A to mark B.
The time of flow of liquid under test is compared with time required for the liquid of known viscosity, the viscosity of unknown liquid.
η1 can be determine using following equation.
η1=ʆ1t1/ ʆ2t2 X η2
ʆ1=Density of unknown liquid
t1 =Time of flow of unknown liquid
ʆ2 =Density of standard liquid
t2 =Time of flow of standard liquid
η2=Viscosity of standard liquid