Question

a doctor orders 150. ml of 1 (m/v) ibuprofen. if you have 8.0 (m/v) ibuprofen on had, how many milliliters do you need

Answer #1

(m/v ) denotes mass concentration,having unit mg/ml i.e. the weight
of solute present per unit volume.

then 1 (m/v) ibuprofen means, 1 grams of ibuprofen present in 1ml
of solution.

the desired amount of solution= 150 ml

in 150 ml 1 (m/v) ibuprofen, amount of ibuprofen present should be
150 grams.

again, the solution we have is 8 (m/v)ibuprofen that is having 8
grams per ml of solution.

so ml of ibuprofen solution that will be having 150 grams ibuprofen
is 150/8 ml.

= **18.75 ml solution(that is the amount required from the
8(m/v) solution) **

this is having 150 grams ibuprofen in 18.75 ml, having mass
concentration= 8 (m/v)

but we want mass concentration of 1 (m/v)

so we will add 150-18.75= 131.25ml water to this solution to make
it 150 ml 1(m/v) ibuprofen.

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