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Determination of Viscosity of Organic Solvents
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Materials Required:

 

  1. Ostwald viscometer
  2. Beaker
  3. Wash bottle
  4. Stop watch
  5. Sucker
  6. Pipette
  7. Electronic balance
  8. Hot Air gun

 

Reagents:

 

  1. Chromic acid
  2. Acetone
  3. Toluene
  4. Nitrobenzene
  5. Water

 

Procedure:

 

To determine the coefficient of viscosity of organic liquids. 

 

  1. Select the liquid from the list.
  2. Click on the button "Fill the liquid".
  3. Click "Start" button.
  4. Click "Stop" button when liquid reaches "label D".
  5. Note the flow time .
  6. Calculate the Viscosity coefficient of the liquid.

 

Liquid Mass (g) Density (g/cm3)
Water 25.06 1.002
Toluene 21.55 0.862
Nitrobenzene 30.01 1.200

 

Observations and Calculations:

 

Solvents Flow Time (sec)
i ii Mean
Water      
Toluene      
Nitrobenzene      

 

 

Room temperature = 30oC

Mass of water = 25.06 g

Mass of Toluene = 21.55 g

Mass of Nitrobenzene = 30.01 g

Time of flow of water=...........................sec

Time of flow of  Toluene=......................sec

Time of flow of Nitrobenzene =............sec

Absolute viscosity of water, «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»§#951;«/mi»«mn»1«/mn»«/msub»«/math» = 0.8007 centipoise

Absolute viscosity of the Toluene, «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»§#951;«/mi»«mn»2«/mn»«/msub»«/math»=........................centipoise

Absolute viscosity of the Nitrobenzene, «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»§#951;«/mi»«mn»2«/mn»«/msub»«/math»=...............centipoise

 

Results:

 

  1. Absolute viscosity of the Toluene = .......................centipoise
  2. Absolute viscosity of the Nitrobenzene =..............centipoise

 

Points to Remember while Performing the Experiment in a Real Laboratory:

 

 

  1. Always wear lab coat and gloves when you are in the lab. When you enter the lab, switch on the exhaust fan and make sure that all the chemicals and reagents required for the experiment are available. If they are not available, prepare the reagents using the components for reagent preparation.
  2. Make sure to clean all your working apparatus with chromic acid and distilled water and ensure that all the apparatus are free from water droplets while performing the experiment.
  3. Make sure to calibrate the electronic weigh balance before taking the measurements.
  4. Ensure that the stop watch and hot air gun are working properly.
  5. Clean all glassware with soap and distilled water. Once the experiment is completed recap the reagent bottles. Switch off the light, and exhaust fan before leaving the lab.
  6. Discard the used gloves in a waste bin.
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by
Amrita CREATE (Center for Research in Advanced Technologies for Education),
VALUE (Virtual Amrita Laboratories Universalizing Education)
Amrita University, India 2009 - 2014
http://www.amrita.edu/create

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