diluent in concentration

by anu
(brampton,ontario,canada)

A 10g vial label states that the concentration is 100mg/ml if you add 87ml.How much you need to add to get a concentration of 50mg/ml.

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diluent in concentration

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May 17, 2011
Help
by: Anonymous

So what is the correct answer i got 43.5 is this correct?

Jan 16, 2011
Too many mLs?
by: Anonymous

I understand how you set up and solved the problem but although 174mL would equal a concentration of 50mg/ml, I think the max that would fit in a 10g vial is 100mL. Would it work if you added 43.5mL (87mL/2) of diluent instead?

Jan 06, 2011
UNDERSTANDING THE QUESTION IS THE KEY
by: CHERRY

10g vial is not relevant

the question simply means how much should be added to get a conc of 50mg/ml.
let the known vol and conc be C1V1
and the unknown vol and conc C2V2
C1V1=C2V2
100MG/ML*87=V2*50MG/ML
V2=174ml
remember how much do you to add is the question
174ml-87ml=87ml
ans=87ml

hint;it became 100mg/ml when 87ml was added another 87mls will make 50mg/ml

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