Question

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A pharmacist need to strengthen a 15% alcohol solution to one of 32% alcohol. How much pure alcohol should be added to 800ml of 15% solution?

Answer 1

Answer:

A pharmacist needs to strengthen a 15% alcohol solution so that it contains 32% alcohol. How much pure alcohol should be added to 100ml of the 15% solution?  

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15% solution DATA:

Amount = x ml ; Amt of active ingredient = 0.15x ml

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Pure alcohol DATA:

Amt = 100-x ml : Amt of active is 100-x ml

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32% solution DATA:

Amt = 100 ml ; Amt of active is 0.32*100 = 32 ml

 

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EQUATION:

active + active = active

0.15x + 100-x = 32

-0.85x = -68

x = 80 ml

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Amt of pure alcohol needed for the solution = 100-x = 20 ml

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Answer 2

Hope it will help you