Chemistry - Blue Bottle Lab
Blue Bottle Lab
Materials: solution, flask and stopper
Procedure: Obtain a sample of the solution from your teacher. Respond to questions 1-10 in your lab report.
Questions:
1. The solution is clear. It's 10 g. of KOH and 8 g. of glucose in 400 ml. of water. A few drops of 1% methgiene blue.
2. The solution turns blue as it is shaken, and slowly changes back to clear.
3. To test you can place a piece of parafilm over the top acting as a stopper.
It is suggested that the substance on the stopper causes the change.
This statement is false it still turns blue with another means of stopping it up.
4. There is a small film of blue liquid at the surface of the clear liquid.
5. It is suggested that the solution contains a dye that simply rises to the surface because of density differences. This is untrue because when shaken the dye is evenly distributed throughout the mixture unlike water and oil that doesn't mix completely.
6.
Duration Time to de blue
5's 1 min. 45 sec.
10's 1 min 59 sec.
15's 2 min 14 sec.
Vitality Time
Hard 2 min, 20 sec.
Medium 1 min. 18 sec.
Soft 58 sec.
# Of Shakes Time
5 33 sec.
10 53 sec.
15 1 min. 52 sec.
7. The other reaction is oxygen. When the solution is shaken the solution is oxidized causing the blue color.
8. Does the reaction eventually run down?
No. It can get the same deep blue and take the same amount to de-blue no matter how many times you do it. (Perform the experiment)
9. Could the reaction occur without air in the flask?
Yes. Even deluded there was a small amount of air in the top that caused the solution, when shaken, to turn a light tint of...
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