User:Elizabeth Ghias/Notebook/Experimental Chemistry/2013/02/11: Difference between revisions

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==Objective==
==Objective==
To crosslink the films prepared last class, to test the effects of using a lower molecular weight PVOH on the film, and to prepare a 0.2 M NaOH solution for use next class.


==Description==
==Description==
<u>Crosslinking</u>
# Determined the concentration of HCl needed, by determining the concentration of H<sub>2</sub>SO<sub>4</sub>
<u>Preparation of Lower Weight PVOH Films</u>
# Measured out 6 1 g samples of PVOH (MW = 22,000)
# Prepared a solution of 0.22 g phenol in 10 mL water.
# Dissolved the PVOH samples in 30 mL water (in 100 mL beakers)
# Once the PVOH had dissolved, the corresponding amounts of phenol solution were added (1% film = 1 mL, 0.1% =
<u>NaOH Calculations and Preparation</u>
* need to prepare 50 mL of a 0.2 NaOH solution from a 0.5 N NaOH soln.
(0.5 moles/L)(X) = (0.2 moles/L)(0.05 L) → X = 0.02 L = 20 mL
# Measure out 20 mL 0.50 NaOH
# Add to 30 mL water
# Save for use on Friday.


==Data==
==Data==
* Add data and results here...
 
No data was collected today.


==Notes==
==Notes==
This area is for any observations or conclusions that you would like to note.


<u> Description of Films Prepared Last Class</u>


Use categories like tags. Change the "Course" category to the one corresponding to your course. The "Miscellaneous" tag can be used for particular experiments, as instructed by your professor. Please be sure to change or delete this tag as required so that the categories remain well organized.
* 1% film prepared in Erlenmeyer flask looked the best, was uniform, etc.
* 0.1% and 9% films were not uniform, had lumps of PVOH
* The poor quality of the films was attributed to the high molecular weight of the PVOH.  


[[Category:Course]]
[[Category:Miscellaneous]]




Revision as of 16:17, 11 February 2013

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Objective

To crosslink the films prepared last class, to test the effects of using a lower molecular weight PVOH on the film, and to prepare a 0.2 M NaOH solution for use next class.

Description

Crosslinking

  1. Determined the concentration of HCl needed, by determining the concentration of H2SO4



Preparation of Lower Weight PVOH Films

  1. Measured out 6 1 g samples of PVOH (MW = 22,000)
  2. Prepared a solution of 0.22 g phenol in 10 mL water.
  3. Dissolved the PVOH samples in 30 mL water (in 100 mL beakers)
  4. Once the PVOH had dissolved, the corresponding amounts of phenol solution were added (1% film = 1 mL, 0.1% =


NaOH Calculations and Preparation

  • need to prepare 50 mL of a 0.2 NaOH solution from a 0.5 N NaOH soln.

(0.5 moles/L)(X) = (0.2 moles/L)(0.05 L) → X = 0.02 L = 20 mL

  1. Measure out 20 mL 0.50 NaOH
  2. Add to 30 mL water
  3. Save for use on Friday.


Data

No data was collected today.

Notes

Description of Films Prepared Last Class

  • 1% film prepared in Erlenmeyer flask looked the best, was uniform, etc.
  • 0.1% and 9% films were not uniform, had lumps of PVOH
  • The poor quality of the films was attributed to the high molecular weight of the PVOH.




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