Blue and Gold Demonstration

1
Blue and Gold Demonstration
2
Blue and Gold Demonstration
Addition of Solution X
Continued Stirring in Air
Addition of Solution X
Continued Stirring in Air
What questions do you have?
3
Blue and Gold Demonstration
Addition of Na2S2O4 a reducing agent
Continued Stirring in O2
Oxidized Indigo Carmine
Reduced Indigo Carmine
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Blue and Gold Demonstration
Addition of Na2S2O4 a reducing agent
Continued Stirring in O2
Oxidized Indigo Carmine
Reduced Indigo Carmine
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Blue and Gold Demonstration
Addition of Na2S2O4 a reducing agent
Continued Stirring in O2
Oxidized Riboflavin
Reduced Riboflavin
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Blue and Gold Demonstration
Addition of Na2S2O4 a reducing agent
Continued Stirring in O2
Oxidized Fiboflavin
Reduced Riboflavin
7
Blue and Gold Demonstration
Oxidized riboflavin fluorescence when irradiated
with ultraviolet light
8
Blue and Gold Demonstration
The dark line on figure to the left depicts the
change in color intensity as a function of added
dithionite for both indigo and riboflavin. What
is happening chemically in regions labeled A, B,
C, and D? Why doesnt the color change as shown
in the diagonal dashed line?
A
B
C
D
Color
?
Continued stirring exposed to air
Successive addition of dithionite