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Chemistry -repost thank you in advance

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I have a bottle of 95% ethanol purchased from the manufacturer.

Normally, when it is not stated, does it mean 95% w/w ethanol?

I need to prepare 100ml of 40% v/v ethanol solution from 95% ethanol.
Please show me the calculation steps.


  • Chemistry -repost thank you in advance -

    when not stated, 95% is v/v

    you want to dilute the ethanol 95/45 times, or 2.111 times. THat means one part alcohol, and 1.111 parts water.

    100ml/2.111=47.37 is a part.
    so, 47.37 ml of 95%
    52.63 ml of water.

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