Homework Answers
The answer is - 70%
70% etahnol solution is used as biocide( which kills microorganisms like virus, bacteria etc).
100% ethanol or absolute alcohol dose not kills the microorganism effectively. As it has no water so it has less penetrance. It can not enter the cell and coagulate every protein inside the cell. It only acts on the surface.
But 70% ethanol can effectively enter the cell and can coagulate the entire cell.
But less than 70% ethanol solution has more water. Thus they are less effective.
So 70% ethanol is used.
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