Experiment to determine viscosity of liquid using ostwald viscometer
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Experiment to determine viscosity of liquid by ostwald viscometer
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Answer:
viscometer
Physical Pharmacy
BACKGROUND
Ostwald viscometer is use 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
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 is 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 can be determined.
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