Site Map

Concentration Problem

by Nikki

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

Click here to add your comments

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 mL


1 gram/ 180 mL= x g/100 mL

180x=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

by: Anonymous

where did the 100ml come from?

percent explanation
by: Nikki

Percent strengths are always computed using number of grams over 100 mL.

Click here to add your comments

Join in and ASK your Questions! It's easy to do. How? Simply click here to return to Math questions.