Yeast Beasts In Action: Lab Investigation

In this lab, we tested different mixtures and their reaction and gas pressure with yeast. We had three test tubes, all containing 3ml of hydrogen peroxide, and 3ml of one different one of the following: Soda (acidic), milk (neutral), and water (base). I had said before we had begun the experiment that the acidic mix would have the most pressure. I had thought this because hydrogen peroxide is acidic, and when yeast and that are mixed, and pretty good sized reaction takes place. Lets see if I was right:

Well... I wasn't. I will say it admit it, even though it is tough to do. Here is what actually happened:

In this lab, the coke mix had an end pressure of 104.69, after two minutes. The milk mix had an end pressure of 104.76 after two min

utes, just beating the coke mix. Lastly, the water mix. The water mix had an end pressure 105.09, beating both the soda and milk mixes.

Picture/graph:

*In red you can see the soda mix. Blue is the milk mix, and green is the water mix. This graph shows up to two minutes.

You can see here obviously that the water mix won, but the weird thing here, is the soda mix. It got off to a great start, looking like it was going to have a HUGE amount of pressure, but the it just leveled out. Im not exactly sure why this happened, maybe an error on our part, or maybe it was just supposed to happen like this.

In the end, I definitely rejected my hypothesis. I was actually dead wrong. What I thought would happen was the complete opposite of what really happened.