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The effectiveness of Antibacterial soapFeatured science projectScience project video

Conclusion

The hypothesis that antibacterial soap will kill more bacteria than normal soap is proven to be true. However the antibacterial soap was effective only if the contaminated object (chopstick) was washed with antibacterial soap for more than 2 minutes.

Many diseases, such as influenza, are caused by viruses and not bacteria. These diseases are not prevented by the use of antibacterial soaps. Washing our hands with warm water and regular soap is sufficient to ward of infections provided that we thoroughly wash our hands, soaping them properly. 

Also consider

The experiment can be repeated by touching the petri plate with a finger instead of using saliva.

Try to repeat the experiment under different room temperatures and/or lighting conditions to ascertain if there is any impact on the rate of growth of the bacteria colonies.

Also consider repeating the experiment with anti-bacterial sprays/hand-rubs.

References

  • Antibacterial soap - http://en.wikipedia.org/wiki/Antibacterial_soap
  • Is antibacterial soap any better than regular soap? - http://health.howstuffworks.com/skin-care/cleansing/myths/question692.htm
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Complexity level:
6
Project cost ($):
10
Time required:
1 day to prepare, 5 days for experiment
Material availability:
Easily found
Safety concerns:

The bacteria should be destroyed before disposal. Pour some bleach into the petri dishes to kill all the bacteria before disposing.