Science Fair

The science fair last week was tons of fun. This is my project:

How Dilute is Vinegar?

Hypothesis
I think the vinegar will be between 90% and 95% water.

Products
Moore Wilson's vinegar and Moore Wilson's baking soda.

Experiment
I will start with ½ mole (42g) NaCO3H (sodium bicarbonate), then pour vinegar into a container and weigh it. I will add the vinegar to the NaCO3H until the mixture stops fizzing. When the mixture stops fizzing, that means that ½ mole (30g) of C2H4O2 (acetic acid) has been added because in the reaction between C2H4O2 and NaCO3H, one molecule of C2H4O2 reacts for every one molecule of NaCO3H that reacts. So for ½ a mole of NaCO3H to react, ½ a mole of C2H4O2 is needed. I will weigh the vinegar again, the difference between the 2 weights of the vinegar is how much vinegar has been added.

Result
612g of vinegar was added, 582g of that was water. The vinegar was 95% dilute.

Conclusion
I was correct in thinking that the vinegar was between 90% and 95% water. My conclusion is that the Moore Wilson's vinegar is 95% dilute. Other types of vinegar could have slightly different amounts of acetic acid in them.

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Josiah did a speech about his project.

Here are some of the photos that mum took of mine and Josiah's projects.





Josiah's project was about "How Successful are Spider webs?"
We are so busy this week with preparation for the competition this weekend.