Blue and Gold Demonstration
Blue and Gold Demonstration
Addition of Solution X
Continued Stirring
in Air
Addition of Solution X
Continued Stirring
in Air
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Blue and Gold Demonstration
Addition of Na2S2O4
a reducing agent
Continued Stirring
in O2
Oxidized
Indigo Carmine
Reduced
Indigo Carmine
Blue and Gold Demonstration
Addition of Na2S2O4
a reducing agent
Continued Stirring
in O2
Oxidized
Indigo Carmine
Reduced
Indigo Carmine
Blue and Gold Demonstration
Addition of Na2S2O4
a reducing agent
Continued Stirring
in O2
Oxidized
Riboflavin
Reduced
Riboflavin
Blue and Gold Demonstration
Addition of Na2S2O4
a reducing agent
Continued Stirring
in O2
Oxidized
Fiboflavin
Reduced
Riboflavin
Blue and Gold Demonstration
Oxidized riboflavin
fluorescence when
irradiated with
ultraviolet light
Blue and Gold Demonstration
Color
A
B
C
D
?
Successive addition of dithionite
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?
Continued stirring
exposed to air
Why doesn’t the color change as
shown in the diagonal dashed
line?