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Conclusion

The hypothesis that Regular Coke and Diet Coke will sink in water is not proven.


Item

Regular Coke

Diet Coke

Water

335g

335g

Sugar

39g

-

Nutra sweet

-

0.1g

Total weight

374g

335.1g

Volume of can

335ml

335ml

Density = Weight / volume

1.11 g/ml

1.00 g/ml

The density of water is 1.0 g/ml. The regular coke can has a density higher than that of water and therefore it sinks in the water. The Diet Coke has a density that is the same  as water and therefore floats in the water.

When 1kg of sugar is added to 5 liter of water, the water's density becomes,
1.0 g/ml + 1000g/5000ml = 1.2 g/ml

After the sugar is added to the water, the density of both the cans becomes less than the sugared water. Therefore both the cans will float in the tank.
 

Also consider

1. Repeat the above experiment  using turpentine or alcohol instead of water. However, be extremely careful when handling flamable liquids such as alcohol/turpentine (Adult supervision required, and the experiment should be done in a well equiped laboratory with proper safety gear/equipment).

2. Try to compare the results by using different types of soda cans.

References

Density - http://en.wikipedia.org/wiki/Density

Which is more dense – Coke or Diet Coke - http://www.elmhurst.edu/~chm/vchembook/121Adensitycoke.html

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Complexity level:
7
Project cost ($):
20
Time required:
1 hour to prepare, 1 hour for experiment
Material availability:
Easily found. May be purchased at a supermarket.
Safety concerns:

None