User:Rebeca Rodriguez/Notebook/Chem 581/2014/08/29

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Objective

  1. To finish completing the film synthesis
  2. Start a new film synthesis
  3. Start and finish Malachite green stock

Description

  1. Completing film synthesis
    1. Warm 150mL of Sodium Sulfate Solution at 80C for 15 minutes
    2. Place both films in Sodium Sulfate Solution at 80C for 1 hour with gentle stirring
    3. Warm 150mL of 1% HCl at 80C for 15 minutes
    4. Place both films in 1% HCl Solution at 80C for 30 minutes with gentle stirring
    5. Place film in 150mL of Sodium Bicarbonate Solution for 15 minutes at room temperature with gentle stirring
  2. Starting new film synthesis
    1. Using Wednesday's Procedure to make new 10% clay-polyvinyl alcohol film
      1. It was 10% by weight clay because we used 1.008g of PVA and 0.1103g of clay
      2. The PVA without clay weighed 1.003g
    2. We also made the following solutions
      1. 25mL 0.20ppm Malachite Green
      2. 25mL 0.50ppm Malachite Green
      3. 25mL 1.1ppm Malachite Green
      4. 25mL 1.4ppm Malachite Green
      5. 25mL 1.7ppm Malachite Green
      6. 50mL 2.0ppm Malachite Green
      7. 50mL 8.0ppm Malachite Green
      8. 50mL 80.0ppm Malachite Green
      9. 50mL 200.0ppm Malachite Green
    3. Take a UV-Visible spectrum of the 0.2ppm to 8ppm standards.
    4. Make a standard curve to determine the molar absorptivity of Malachite Green

Solution Preparation

  • Complete film synthesis
  1. 0.2M Sodium Sulfate Solution
    1. I dissolved 22.034g of anhydrous Na2SO4 in 1000mL of water
    2. I added 100mL of concentrated H2SO4 to this solution
    3. This solution will be used to enable the reaction between polyvinyl alcohol and glutaraldehyde in order to cross link the polymer film
  2. 1% wt. HCl Solution
    1. I added 10mL of concentrated HCl to 985mL of water
    2. This solution will be used to enable the reaction between polyvinyl alcohol and glutaraldehyde in order to cross link the polymer film
  3. 0.2M Sodium Bicarbonate Solution
    1. I dissolved 17.042g of NaHCO3 in 1000mL of water
    2. This solution will be used to neutralize the acid in your films

UV-vis spectra of Malachite Green Solutions from 0.2ppm to 8ppm

Weight of film soaked in solution

  • Table of PVA films
Concentration Mass of Vile (g) Mass of Vile w/ PVA (g) Mass of PVA (g)
2 ppm13.098813.21810.1193
8 ppm12.97613.01680.0408
80 ppm12.877613.01080.1332
200 ppm13.031313.08790.0566
  • Table of PVA-clay films
Concentration Mass of Vile (g) Mass of Vile w/ PVA & Clay (g) Mass of PVA & clay (g)
2 ppm12.992413.09360.1012
8 ppm13.144713.18540.0407
80 ppm13.044113.14840.1043
200 ppm13.156313.23330.077



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