MATH

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I have about 30 questions of this, so I need to understand the process. Please make it as detailed as possible! Thank you!

Q: To reduce 32 grams of a 25% solution of antiseptic to a 10% solution, how much distilled water should a pharmacist add?

A: Equation: _____
Answer is: _____

  • MATH -

    Something usually stays the same, in your case it would be the amount of antiseptic which would be 25% of 32 g or 8 g.

    So let's add x g of distilled water, so now we have (32+x) g.
    10% of that is still 8 g of the antiseptic.

    so equation : 10/100(x+32) = 8

    solve that to get x = 48 g

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