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anonymous

  • 5 years ago

A druggist wants to reduce a 20 ounce quantity of a 7% solution of iodine to a 4% solution by adding pure alcohol. How much alcohol must he add to accomplish this. (I really need help setting it up.)

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  1. anonymous
    • 5 years ago
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    So you begin with 20 ounces and 7% of that is Iodine, that's 1.4 oz. And it needs to be diluted so that the 1.4oz is 4%, so 1.4/.04 = 35oz 20-->35 oz, so 15oz

  2. anonymous
    • 5 years ago
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    I wasn't sure if you meant 7% of the 20 oz was Iodine, or 20oz was 7% of the whole thing.

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