MY ~~awesome~~ SRP

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Sunday, March 7, 2010 @ 10:00 AM

So, my SRP will be

"Do preservatives stop the growth of bacteria?"
The independent variable in this experiment will be- the amount of chicken stock I use and the types of preservatives I use.
The preservatives that I will be using are
- Lemon Juice - Salt
- Sugar - White Vinegar
This means that the dependant variable will be the amount in bacteria in my stock.
The controlled variables will be the number of days that the preservatives are left in the stock and where I leave the stock.
-I know that I am supposed to have researched several other experiments which I could do, but this is the only one that I really want to do……

The method I am going to use for conducting this experiment will be:
1. Dissolve 2 cubes of chicken stock in 1 litre of hot water
2. Pour the mix into 5 cups, each cups MUST have the same amount
3. Add 2 tablespoon of each preservative in a different cup. Make sure to label the cups with a label that clearly indicates the type of preservative added.
4. Add no preservative into the 5th cup because this is the control. Clearly label this cup as the control.
5. Leave the 5 cups in the same warm place (window sill of kitchen) for 3 days.
6. At the end of the 3 days look at the cups and observe which one is cloudier.

I haven't figured out how I am going to measure the cloudiness.....but I'm getting to that.
I hope that I have done this correctly, especially the independent variables and stuff...... :s

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