1. Fill-out the following table with your results in the qualitative experiments. Interpret your observations. See for example the results from Vial D.
Qualitative results
|
Effect |
BaC03 | ||
|
Major discoloration, |
Bubbling, |
precipitate, | |
|
Reaction vial |
yes or no |
yes or no |
yes or no |
|
A/ Blank | |||
|
B/ Fe2+ alone | |||
|
C/ H202 alone | |||
|
D/H202 + Mn2+ |
NO |
YES |
NO |
|
E/H202 + Fe2+ | |||
|
F/ UV alone | |||
|
G/ H202 + UV |
Interpret each one of your results:
Vial G:
2. Insert your absorbance vs wavelength spectra for all the samples. Estimate the percentage of the absorbance reduction observed in each sample at the maximum-absorbance wavelength (fill-in the following table). Interpret your observations.
500 600
Wavelength
|
Sample in Vial |
Absorbance |
Absorbance decrease, % |
|
A | ||
|
B | ||
|
C | ||
|
D | ||
|
E | ||
|
F | ||
|
G |
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