Pressure of the 3 tests. (acid-red, neutral-blue, base-green)
Which creates the most pressure when mixed with yeast, an acid, a neutral, or a base?
Base!
What was done to get that answer:
We got 3 test tubes on a rack and labeled them A, N, and B. Then we placed 3 mL of of hydrogen peroxide into each test tube, using a dropper. The test tubes each got a similar reactant and a different reactant. In the test tube labeled A we placed an acid, in this case we used diet soda . In the test tube labeled N we but used a neutral reactant, milk. And in the test tube labeled B we placed a base, antacid.
Once this was done we placed 2 drops of the yeast suspension, water and yeast, in the first test tube, A, and placed the one hole stopper on top. We collected information for two minutes. We repeated this with the other two test tubes as well.
A:
When test A was first mixed the mixture was cloudy and had some bubble, which could have been carbonation.
N:
When test N was mixed not much happened. Then when we did the pressure test the pressure rose at about the same pace test A had. We noticed that at the end of testing it with yeast the mixture had a thick layer of bubbles on it.
B:
The air pressure rose ate the same speed as the other tests. A thin layer of bubbles formed on the top of the mixture.
Hypothesis:
If we mix an acid, a base, and a neutral reactant with yeast and see which has the most pressure, then the acid would have the most pressure. I think that the acid would create the most pressure because the soda-hydrogen peroxide mixture will break down the yeast and release the gas that is in the yeast.
Is this right?
No!
Why?
Pressure:
Acid:
Start pressure- 101.31
End pressure- 106.2
Neutral:
Start pressure- 99.48
End pressure- 104.1
Base:
Start pressure- 99.89
End pressure- 106.73
The base got the highest pressure but only by .53.
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