Determination of Radius of Glycerol by Viscosity Measurement

Determination of Radius of Glycerol by Viscosity...

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Mapúa Institute of Technology School of Chemical Engineering, Chemistry, Biological Engineering and Materials Science Engineering  Determination of Radius of Glycerol Molecule by Viscosity  Measurement Austria, Meynard 1  Romero. Von Joby M.  2   Acosta, Joy 3  Javier, Danica U. 4  Lagamayo, Linear L. 5  Perile, Gracielle Anne 6 1 Professor, School of Chemical Engineering, Chemistry, Biological Engineering and Materials Science Engineering, Mapua Institute of Technology;  2 Author, Student, CHM170/A41 Physical Chemistry  Laboratory 1,  Biological Engineering and Chemistry, Mapua Institute of Technology  3,4,5,6 Members, Student, CHM170/A41 Physical Chemistry Laboratory 1,  Biological Engineering and Chemistry, Mapua  Institute of Technology   Objectives To determine the viscosity of glycerol at very small concentration To determine the radius of assumed spherical molecule of glycerol through measuring its viscosity at various dilute  concentrations To compare the obtained radius with the estimated radius of the spherical molecule through physical data Keywords:  Viscosity, Glycerol, molecular size, infinite dilution, limiting slope method Theory Viscosity Flow Viscosity is basically the measure of internal resistance of a  fluid to flow. This vital property of substances can be defined  as the fluid friction and is related to the capacity of individual  molecules   on   a   certain   fluid   to   move   with   respect   to   one  another. Thus, viscosity depends oh how each molecule is  attracted to one another. The strength of these attractions is  affected by the composition, size and shape, the kinetic energy  of the molecules, which is dependent on temperature, and the  intermolecular forces of the fluid. Figure 1. Differential flow of two sheets, showing the velocity gradient and  the area of contact. When two layers of fluid move past one another with a certain  velocity, both layers experience a force which tends to oppose  their relative motions. The magnitude of this force is dependent  on   two   factors,   namely   the   area   of   the   plane   of   contact  between the layers and the velocity gradient normal to it. This  scenario is similar to sliding of palm of one hand over the other.  Mathematically, the effect is expressed as: = F Adudx 1 where u is the velocity of the flow, du is the difference in  velocity   between   two   fluid   layers,   dx   is   the   difference   in  position, normal to the flow, between two fluid layers and A is  the area of contact. By definition, F/A is termed as the “viscous  shear stress”,  . τ One method of determining viscosity is through the use of an 
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This note was uploaded on 07/31/2011 for the course CHEM 170L taught by Professor Maynardaustria during the Spring '11 term at Mapúa Institute of Technology.

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Determination of Radius of Glycerol by Viscosity...

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