# Concentration Problem

by Nikki
(Frisco,Tx)

A single use packet contains one gram of Drug S, as well as 8.4 grams of additional ingredients and sweetening agent. The directions are to dissolve the contents in 6 oz (180 mL) of sterile water. Not accounting for displacement effect, what is the approximate concentration strength of Drug S in the final solution?
A. 6.50%
B. 0.05%
C. 1.25%
D. 0.56%

### Comments for Concentration Problem

 answer by: Anonymous The answer is D. 0.56%You only need to be concerned with the active drug in the ingredients, as that will determine concentration.Thus 1 gram active/180 mL total (roughly)Percent Strengths are always given in x g/100 mLso:1 gram/ 180 mL= x g/100 mL180x=100-->x=0.5555 or 0.56%

 concentration problem by: Anonymous Where do you get 0.5555 from.

 concentration problem, solving for "x" by: Nikki To solve for "x", divide both sides of the equation by 180. So, 100 divided by 180 equals 0.5555

 question by: Anonymous where did the 100ml come from?

 percent explanation by: Nikki Percent strengths are always computed using number of grams over 100 mL.