What is the strength (% w/w) of a cortisone ointment prepared by mixing 50 grams of 8% ointment, 100 grams of 12% cort...
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What is the strength (% w/w) of a cortisone ointment prepared by mixing 50 grams of 8% ointment, 100 grams of 12% cortisone ointment, and 20 grams of ointment base?
5.00%
9.33%
8.57%
9.41%
6.67%
Homework Answers
Total mass = 50+100+20 = 170 grams.
Mass of cortisone oinment = 12×100/100 = 12 grams
Mass ointment = 8×50/100 = 4 gram
Total cortisone ointment = 12+4 = 16 gram
%w/w of cortisone = mass of cortisone ointment×100/total mass
= 16×100/170
= 9.41 %
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