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Questions asked by users might not always be phrased in the clearest way.
The question seems to be asking about the volume of pure alcohol needed to make a solution. To solve this, we'll need to use the concept of concentration and dilution. Please clarify: Are you looking for the volume of pure alcohol to add to a 500ml solution to make it 25% alcohol, or are you asking for the volume of pure alcohol already present in a 500ml solution that is 25% alcohol?