Question about dilution

by Carolyn

After adding 20ml of Sterile Water for Injection to a 4gm vial of powdered drug, the concentration is 325mg/2ml. What is the powder volume of the drug? {remember powder volume is equal to final volume-diluent added)

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Question about dilution

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Nov 12, 2011
Xaviers girl
by: Anonymous

first set up the problem....
325mg/2ml = 4g/xml
convert grams to milligrams
325mg/2ml= 4000mg/xml
Cross Multiply
325(X)= 2(4000)

solve for powder volume
24.61ml-20ml(inital volume)=4.61 ml

Jun 16, 2011
by: Anonymous

Convert : 4 gm of powder drug to mg, since you have concentration, you'll get final volume.

2ml/325mg x 4000mg = 24.6ml

24.6ml - 20ml = 4.6ml (powder volume)

May 28, 2011
Can't sove this one either.
by: Anonymous

Please someone: What's the right way to do this one?

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