To study the effect of viscosity on the rate of filtration

Aim: To study the effect of viscosity on the rate of filtration.


Chemicals: Calcium carbonate And glycerin

Instruments/ Apparatus: Beakers, Buchner funnel Of Various sizes, Glass rod, Measuring Cylinder, Stopwatch.


  • An increase in the viscosity of the liquid will decrease the flow rate. The increase in viscosity of filtrate will increase the resistance to flow so that the rate of filtration is inversely proportional to the viscosity of flow.
  • This problem can be overcome by increasing the temperature of a liquid or by reducing the concentration of solids in the liquid.
  • The vehicles containing different concentrations of glycerine–water mixtures are used. Viscosity increases with an increase in the concentrations of glycerine in the mixture.


(Effect of viscosity on the rate of filtration):

  1. Buchner funnels with filter paper are arranged properly.
  2. Three different solutions, viz. water, 5% glycerine in water, and 20 % glycerine in water are taken for the experiments.
  3. The prepared solutions are passed through filtration assembly separately.
  4. The time required to collect 50ml of filtrate is recorded.
  5. The rate of filtration is calculated using the following equation.

Observation And calculations:

To study the effect of viscosity on rate of filtration

Observation Table:

Sr. noSample nameViscosity of sampleFiltration time required for 50 ml of filtrate (min)Rate of filtration (ml /min)


Make sure you also check our other amazing Article on: How do you calculate filtration rate?
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