Question

a parachemist needs to strengthen a 15% alcohol solution to one of 32% alcohol. how much pure alcohol should be added to 800m of 15% solution

Answer 1

400ml has 15% alcohol i.e 60ml .

This means we have 340ml of water or the liquid with which alcohol is mixed 

Let V be the volume of alcohol added to make the strength 32%

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V/340+V = 32/100. solving this we get V as 160ml

so we need to add 160 -60 = 100ml of alcohol 

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