User:Elizabeth Ghias/Notebook/Experimental Chemistry/2012/11/30

Objective

To conduct the salt test on the porphyrin film, to take UV-Vis of the remaining solutions, and to measure the sodium content of the PVOH/glutaraldehyde film that was soaked in NaOH.

Description

• The acetone that the dye film was placed in was changed.

Porphyrin Salt Test

1. The porphyrin film was removed from the 2% wt H₂SO₄ and was placed in 50 mL of the sodium sulfate prepared last class.
2. The time for the porphyrin film to change from green to pink was recorded. (took
3. The film was sliced to have the width of the UV-Vis cuvette.
4. The thickness of the film was measured.
5. The sliced film was placed in the cuvette and a UV-Vis spectra was taken.
6. The sliced film was then placed into additional 2% wt H₂SO₄ until it turned green. (Time to turn green =
7. Once the film slice had turned green, it was placed into 50 mL of the solution of aluminum sulfate prepared last class.

Data

• Add data and results here...

Notes

• start time for soaking in sodium sulfate was 1:32
• The old acetone that the dye film was placed in (on Wednesday) was still clear in color.
• The H₂SO₄ solution that the porphyrin has been soaking in since Wednesday was green (when the film was removed from it)
• At the end of 2 hours and 15 minutes, the porphyrin film was still green, so we left it to soak in the sodium sulfate solution over the weekend. UV-Vis will be taken on Monday.