User:Elizabeth Ghias/Notebook/Experimental Chemistry/2012/10/15

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Current revision (16:49, 26 November 2012) (view source)
 
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*All of the voltage values should be negative.  The table feature would not allow the negative signs to be included.
==Notes==
==Notes==

Current revision

Experimental Chemistry Main project page
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Objective

To remake the glutaraldehyde films containing clay, to make a film with porphyrin, and to measure sodium ion content using a sodium electrode.

Description

Making Glutaraldehyde Films

  • 4 films were made - (1)PVOH/glutaraldehyde, (2)PVOH/Na-MT/glutaraldehyde, (3)PVOH/100% CEC Clay/glutaraldehyde, and (4)PVOH/porphyrin/glutaraldehyde
  1. Film 1 was made by dissolving 1 g PVOH in 7 mL of water. Once all the PVOH had dissolved, 1 mL of glutaraldehyde was added. The solution was stirred for 5 minutes and then was poured into a dish and allowed to evaporate until Wednesday.
    • Actual amount of PVOH = 1.0059 g
  2. Film 2 was made by dissolving 1 g PVOH and 0.1 g Na-MT in 7 mL of water. Once they had dissolved, 1 mL of glutaraldehyde was added. The solution was allowed to mix for 5 minuntes and then was poured into a dish and allowed to evaporate until Wednesday.
    • Actual amount of PVOH = 1.0021 g, actual amount of Na-MT = 0.1016 g
  3. Film 3 was made by dissolving 1 g PVOH and 0.1 g 100% CEC clay in 7 mL of water. Once they had dissolved, 1 mL of glutaraldehyde was added. The solution was allowed to stir for 5 minuntes and then was poured into a dish and allowed to evaporate until Wednesday.
    • Actual amount of PVOH added = 1.0014 g, actual amount of 100% CEC clay = 0.1004 g.
  4. Film 4 was made by dissolving 1 g PVOH in 7 mL of water. Once it dissolved, 1 mL of glutaraldehyde and 1 mL of porphyrin was added. The solution was allowed to mix for 5 minutes and then was poured into a dish and allowed to evaporate until Wednesday.


Determining the Sodium Ion Content

  • The sodium ion content of the sodium standards ([]= 0.25,1,3,7,9 ppm) were measured
  1. An 0.1 mL of ionic strength adjuster (4M solution containing NaOH) was added to a 3 mL of each solution to be tested, so that the pH of each solution would fall in the range of pH = 8 to 10.
  2. The electrode was placed into each of the solutions and were allowed to equilibrate for 2 minutes.
  3. This procedure was done for all of standards


Data

Sodium Electrode Results

Sample Negative Voltage (mV)
Water + Adjuster *****
0.25 ppm + Adjuster 175.1
1 ppm + Adjuster 170
3 ppm + Adjuster 158.5
7 ppm + Adjuster 146.4
9 ppm + Adjuster 139.8
  • All of the voltage values should be negative. The table feature would not allow the negative signs to be included.

Notes

  • For an ion selective electrode, higher concentrations have more negative voltages.
  • The film containing the porphyrin had a light pink color to it.



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