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 Experimental Chemistry
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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
- 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
- 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
- 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.
- 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
- 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.
- The electrode was placed into each of the solutions and were allowed to equilibrate for 2 minutes.
- This procedure was done for all of standards
Data
Sodium Electrode Results
| Sample
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Voltage (mV)
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| Water + Adjuster
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*****
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| 0.25 ppm + Adjuster
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175.1
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| 1 ppm + Adjuster
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170
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| 3 ppm + Adjuster
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158.5
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| 7 ppm + Adjuster
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146.4
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| 9 ppm + Adjuster
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139.8
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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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Experimental Chemistry
