User:Elizabeth Ghias/Notebook/Experimental Chemistry/2013/02/15: Difference between revisions

From OpenWetWare
Jump to navigationJump to search
(Autocreate 2013/02/15 Entry for User:Elizabeth_Ghias/Notebook/Experimental_Chemistry)
 
No edit summary
(2 intermediate revisions by the same user not shown)
Line 10: Line 10:


==Objective==
==Objective==
To crosslink the films prepared last class, to try the new reaction with (S)-(-)-(3-Chloro-2-hydroxypropyl)trimethylammonium chloride


==Description==
==Description==
<u>Crosslinking Films</u>
# Heat 5 beakers with 100 mL of 0.7 M HCl
# Once heated to 70 °C add the five films. 
# Heat the films for 1 hour
# Prepare 5 solutions of 1.68 g sodium bicarbonate in 100 mL water
# Rinse the films in distilled water, then place in sodium bicarbonate solution.
# Allow to soak in bicarbonate solution for 15 minutes.
# Rinse films in distilled water and then dry to run DSC.
<u>(S)-(-)-(3-Chloro-2-hydroxypropyl)trimethylammonium chloride Reaction</u>
# Measure out 4 samples of 2 g PVOH (MW = 22,000)
# Measure out 0.85779 g (S)-(-)-(3-Chloro-2-hydroxypropyl)trimethylammonium chloride. Place in 5 mL 0.2 M NaOH prepared last class)
#* Actual amount used = 0.8581 g
# Transfer 0.5 mL, 0.05 mL, and 0.005 mL into 4.5 mL, 4.95 mL and 4.995 mL 0.2 M NaOH, respectively (this means the 10% film will be slightly less than 10% but we can still calculate what percentage)→ using 10 mL total volume b/c were doing 2 gram scale.  For 1 g scale use 5 mL.
# Place the 4 samples of PVOH in 5 mL
# Allow to soak in the NaOH for 30 minutes
# Add 1 sample PVOH to one of the ammonium chloride samples and allow them to mix for 1 hour
# If the PVOH is still soluble in NaOH, add acetone to precipitate it out. (keep water to a minimum)
# Then do a quick wash with ice water to get precipitate out extra ions


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


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


[[Category:Course]]
* When the acetone was added to precipitate out the modified PVOH, the PVOH precipitated out as a white solid (looked like cotton)
[[Category:Miscellaneous]]
* The samples will be filtered next class




Revision as of 12:24, 22 February 2013

Experimental Chemistry <html><img src="/images/9/94/Report.png" border="0" /></html> Main project page
<html><img src="/images/c/c3/Resultset_previous.png" border="0" /></html>Previous entry<html>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</html>Next entry<html><img src="/images/5/5c/Resultset_next.png" border="0" /></html>


Objective

To crosslink the films prepared last class, to try the new reaction with (S)-(-)-(3-Chloro-2-hydroxypropyl)trimethylammonium chloride

Description

Crosslinking Films

  1. Heat 5 beakers with 100 mL of 0.7 M HCl
  2. Once heated to 70 °C add the five films.
  3. Heat the films for 1 hour
  4. Prepare 5 solutions of 1.68 g sodium bicarbonate in 100 mL water
  5. Rinse the films in distilled water, then place in sodium bicarbonate solution.
  6. Allow to soak in bicarbonate solution for 15 minutes.
  7. Rinse films in distilled water and then dry to run DSC.


(S)-(-)-(3-Chloro-2-hydroxypropyl)trimethylammonium chloride Reaction

  1. Measure out 4 samples of 2 g PVOH (MW = 22,000)
  2. Measure out 0.85779 g (S)-(-)-(3-Chloro-2-hydroxypropyl)trimethylammonium chloride. Place in 5 mL 0.2 M NaOH prepared last class)
    • Actual amount used = 0.8581 g
  3. Transfer 0.5 mL, 0.05 mL, and 0.005 mL into 4.5 mL, 4.95 mL and 4.995 mL 0.2 M NaOH, respectively (this means the 10% film will be slightly less than 10% but we can still calculate what percentage)→ using 10 mL total volume b/c were doing 2 gram scale. For 1 g scale use 5 mL.
  4. Place the 4 samples of PVOH in 5 mL
  5. Allow to soak in the NaOH for 30 minutes
  6. Add 1 sample PVOH to one of the ammonium chloride samples and allow them to mix for 1 hour
  7. If the PVOH is still soluble in NaOH, add acetone to precipitate it out. (keep water to a minimum)
  8. Then do a quick wash with ice water to get precipitate out extra ions


Data

No results were collected today

Notes

  • When the acetone was added to precipitate out the modified PVOH, the PVOH precipitated out as a white solid (looked like cotton)
  • The samples will be filtered next class



Retrieved from "https://openwetware.org/mediawiki/index.php?title=User:Elizabeth_Ghias/Notebook/Experimental_Chemistry/2013/02/15&oldid=678615"