Question

6.
What happen if we shake this set-up
BaCl, Solution
Na SO, Solution
a)
b)
c)
d)
white colour appeared in the flask
Remain unchanged
The froath will appear
Blue colour appeared in the flask​

Answer 1

When you shake the bottle, the oxygen in the air mixes with the solution and re-oxidizes the methylene blue, turning the liquid blue. When the shaking stops and the liquid stands still, the blue colour disappears again as the potassium hydroxide and glucose solution continues to reduce the dye.

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