User:Elizabeth Ghias/Notebook/Experimental Chemistry/2013/02/11 - Revision history

Elizabeth Ghias at 17:13, 12 February 2013

Elizabeth Ghias — Tue, 12 Feb 2013 17:13:37 GMT

←Older revision		Revision as of 17:13, 12 February 2013
Line 17:		Line 17:
	<u>Crosslinking</u>		<u>Crosslinking</u>

-	# Determined the concentration of HCl needed, by determining the ~~concentration~~ of H<sub>2</sub>SO<sub>4</sub>	+	# Determined the concentration of HCl needed, by determining the amount of H+ in the H<sub>2</sub>SO<sub>4</sub> used in previous crosslinking.
-		+	#* 20ml of 100% H2So4 in 1 L of H20 was used, assuming complete dissociation
-		+	#** 20ml* 1.84g/ml ÷ 98.079g/mol = 0.375moles of H2SO4 ÷ 1 Liter= 0.369 Molar H2SO4
-		+	#** 0.369mols of H2SO4/L * 2mols HCl/1mol of H2SO4 = 0.7M HCl → 6ml of 12 M HCl
		+	# Heat up a solution of 94 mL water and 6 mL 12 M HCl to 70°C
		+	# Place the film in the solution and heat for 1 hour.
		+	# Prepare a solution of bicarbonate (1.68 g in 100 mL).
		+	# At the end of one hour, remove the films from the HCl, rinse with water, then place in the sodium bicarbonate solution for 15 minutes.
		+	# Then remove the films from the bicarbonate solution and place in water.
		+	# Leave the films in water until Friday.


Line 28:		Line 34:
	# Prepared a solution of 0.22 g phenol in 10 mL water.		# Prepared a solution of 0.22 g phenol in 10 mL water.
	# Dissolved the PVOH samples in 30 mL water (in 100 mL beakers)		# 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% =	+	# Once the PVOH had dissolved, the corresponding amounts of phenol solution were added (1% film = 1 mL, 0.1% = 0.1 mL, 0.01% = 0.01 mL, 8.5% = 8.5 mL)
		+	# 1 mL glutaraldehyde was added to each film
		+	# The solution was allowed to stir and then was poured into an plastic dish and allowed to evaporate until Friday.

Elizabeth Ghias at 23:17, 11 February 2013

Elizabeth Ghias — Mon, 11 Feb 2013 23:17:29 GMT

←Older revision		Revision as of 23:17, 11 February 2013
Line 10:		Line 10:

	==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]]~~	+

Elizabeth Ghias: Autocreate 2013/02/11 Entry for User:Elizabeth_Ghias/Notebook/Experimental_Chemistry

Elizabeth Ghias — Mon, 11 Feb 2013 20:19:32 GMT

Autocreate 2013/02/11 Entry for User:Elizabeth_Ghias/Notebook/Experimental_Chemistry

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{|{{table}} width="800"
|-
|style="background-color: #EEE"|[[Image:BDLlogo_notext_lr.png|128px]]<span style="font-size:22px;"> Experimental Chemistry</span>
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|-
| colspan="2"|


==Objective==

==Description==

==Data==
* Add data and results here...

==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]]
[[Category:Miscellaneous]]


|}

__NOTOC__