Why We Use 75% Alcohol In Disinfectant Why Not 100%?


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Something to consider: Purifying alcohol is expensive.  Each time you distill it you can make it more pure but this also costs more.  The maximum you can reach this way is about 95% purity (a property called a minimum boiling azeotrope I think).  I guess what I'm saying is, if 75% works, why spend so much more to make it 95 or 100%?

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