Calculate the mass of the liquids collected in surface tension determination. 2. Calculate the average drop mass by dividing the mass of liquid collected with the number of drops
Calculate the mass of the liquids collected in surface tension determination. 2. Calculate the average drop mass by dividing the mass of liquid collected with the number of drops
Physical Chemistry
2nd Edition
ISBN:9781133958437
Author:Ball, David W. (david Warren), BAER, Tomas
Publisher:Ball, David W. (david Warren), BAER, Tomas
Chapter22: Surfaces
Section: Chapter Questions
Problem 22.49E
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1.Calculate the mass of the liquids collected in surface tension determination.
2. Calculate the average drop mass by dividing the mass of liquid collected with the number of drops.
3. Calculate the drop volume using Eqn 3b-4.The literature values of the density of water and ethanol can be seen in
Table 3b-5. Assume that the temperature is 30°C.
4. Before computing for the surface tension, determine the correction factor (f) at r/v1/3
, where r is the outer radius
of the burette tip, using Table 3b-4. To locate f in the table, use the following example as guide:
If r/v1/3 = 0.32, then find what values in the row and column headings will make a sum of 0.32. In this case, 0.3
(row) plus 0.02 (column) equals 0.32. Thus, f = 0.72313.
5. Finally, calculate the surface tension using Eqn 3b-3:
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