User:Elizabeth Ghias/Notebook/Experimental Chemistry/2013/02/11: Difference between revisions
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<u>Crosslinking</u> | <u>Crosslinking</u> | ||
# Determined the concentration of HCl needed, by determining the | # 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. | |||
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# 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. | |||
Revision as of 10:13, 12 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> </html>Next entry<html><img src="/images/5/5c/Resultset_next.png" border="0" /></html> |
ObjectiveTo 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. DescriptionCrosslinking
(0.5 moles/L)(X) = (0.2 moles/L)(0.05 L) → X = 0.02 L = 20 mL
DataNo data was collected today. NotesDescription of Films Prepared Last Class
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