User:Moira M. Esson/Notebook/CHEM-581/2012/08/31: Difference between revisions
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#* Use 1.25 mL of 15.95 mM solution to dilute to 3.99 mM | #* Use 1.25 mL of 15.95 mM solution to dilute to 3.99 mM | ||
#* Use 6.25 mL of 15.95 mM solution to dilute to 1.99 mM | #* Use 6.25 mL of 15.95 mM solution to dilute to 1.99 mM | ||
==Viscosity of PVOH Stock | ==Viscosity of PVOH (MW 22000) Stock Solution== | ||
'''General Procedure''': | '''General Procedure''': | ||
#Using an ASTM kinematic viscometer, time the rate at which H<sub>2</sub>O flows from the top most line to the bottom most line. Run at least three trials | #Using an ASTM kinematic viscometer, time the rate at which H<sub>2</sub>O flows from the top most line to the bottom most line. Run at least three trials | ||
#*'''Note''':The amount of solution in the viscometer does not matter, but the viscometer can hold no more than 10mL | #*'''Note''':The actual amount of solution in the viscometer does not matter, but the viscometer can hold no more than 10mL. Approximately 10mL should be used | ||
#Measure the temperature of the surroundings. Record the temperature | #Measure the temperature of the surroundings. Record the temperature | ||
# | #Wash the viscometer with the solution that needs to be tested. Wash by drawing the solution into the viscometer with a pipette pump past the top of the lower bulb and then allowing the solution to drain | ||
# | #Wash the viscometer at least two times then discard the solution | ||
#Repeat steps | #Pour approximately 10mL of the solution into the viscometer | ||
#Draw the solution up past the lower bulb of the viscometer using a pipette pump | |||
#Remove the pipette pump and let the solution drain from the viscometer. Once the bottom of the meniscus passes the first mark on the viscometer, start a stopwatch | |||
#Stop the stop watch once the bottom of the meniscus passes the lower mark on the viscometer | |||
#Repeat steps 6 through 8 at least two more times to obtain an average time in seconds for the solution to move between the two marks. | |||
*'''Note''': Solutions should be run through the viscometer with increasing concentration(i.e. The lowest concentrated stock solution should be used first) | |||
'''Viscosity Calculations''' | '''Viscosity Calculations''' | ||
Revision as of 18:47, 6 September 2012
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Objectives
PVOH plus acid films
Preparation of PVOH Stock Solutions
Viscosity of PVOH (MW 22000) Stock SolutionGeneral Procedure:
Preparation
Observations
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