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How does toothpaste work?
How does Toothpast work?
 
Subject Chemistry
Level Lower secondary
Language English
Type Experiment

 
 
Bacterial suspension is inoculated on the Petri dish, but toothpaste can stop the bacterial growth.

Bacterial suspension is inoculated on the Petri dish. One day later, a hole is made in the middle of the agar plate and filled with commercial toothpaste.

Two days later, you can see a distinct zone around the toothpaste, where the bacterial growth is eliminated due to chemical compounds from the toothpaste diffusing into the agar medium.
 
 
Contact details
 
NameOndrej Koukol
Emailo.koukol@seznam.cz
 
 

 


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