An Ostwald viscometer is calibrated using water at 20°C , . It takes 15.0 s for the fluid to fall from the upper to the lower level of the viscometer. A second liquid is then placed in the viscometer, and it takes 37.0 s for the fluid to fall between the levels. Finally, 100. mL of the second liquid weighs 76.5 g. What is the viscosity of the liquid?

Viscosity of liquid cP

Explanation:

The viscosity of the liquid is determined by

Where A represents the viscometer constant

ρ is the density of the fluid

∆t is the time required to  move through the viscometer.

First, we will derive the viscometer constant using the data for water  -

Substituting the given values in above equation, we get -

Viscosity of the second liquid is

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