Determination of viscosity of liquid using Ostwald viscometer

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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.

η11t1/ 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.

LIQUIDTIME OF FLOWDENSITYVISCOSITY
IIIIIIMEAN
WATER
ETHANOL
ACETONE
TOLUENE


CONCLUSION

Viscosity of the unknown liquid is __________ found to be ________is determined by using Ostwald viscometer.

Also Read:

REFERENCES

  1. More HN, Hajare AA. Practical Physical Pharmacy. Career Publications. 2010:141-142.
  2. Gaud RS, Gupta GD. Practical Physical Pharmacy. CBS Publisher and Distributors. 2009:56-57.
  3. Mohanta GP. Physical Pharmacy Practical Text, Pharma Book Syndicate. 2006: 63-64.

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FAQs

How do you use the Ostwald viscometer 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.

How do you determine the viscosity of a liquid?

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