137 A doctor orders 190 mL of 3 mv ibuprofen If you have 10

1.37 A doctor orders 190. mL of 3 % (m/v) ibuprofen. If you have 10. % (m/v) ibuprofen on hand, how many milliliters do you need?

Solution

doctor order 190 ml ibuprpfen which is 3 % m/v

that mean active mass of ibuprofen = 190 X 3 / 100 = 5.7 gm

so doctor recomded 5.7 gm ibuprofen

then in 10% ibuprofen 100 ml contain 10 gm ibuprofen then for 5.7 gm ibuprofen required ml = 5.7 X 100 / 10

= 57 ml

57 ml of 10 % m/v ibuprofen you need.