Chemistry, asked by manishgowda3314, 1 year ago

How to calculate viscosity average molecular weight?

Answers

Answered by Anonymous
0

Viscosity of liquid is measured by comparing the flow times of two liquids of equal volumes using same viscometer. The molecular weight of the polymer is measured by using viscometer and the molecular weight obtained by this technique is called viscosity average molecular weight.

Answered by bhaveshvk18
0

hey

Viscosity is an internal property of a fluid that offers resistance to flow. It is due to the internal friction of molecules and mainly depends on the nature & temperature of the liquid.

Many methods are available for measuring viscosity of polymer solution. The Ostwald method is a simple method for the measurement of viscosity, in which viscosity of liquid is measured by comparing the viscosity of an unknown liquid with that of liquid whose viscosity is known. In this method viscosity of liquid is measured by comparing the flow times of two liquids of equal volumes using same viscometer.

Consider two liquids are passing through a capillary of same viscometer. Then the coefficient of viscosity of liquid (η2) is given by equation

n = n1p2t2 / p1t1

Here t1 and t2 are the time of flow of the liquids and ρ1 and ρ2 are the respective densities. And η1 is the coefficient of viscosity of water.

For a given liquid η has a specific value at the same temperature.

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