Answers
The given ointment has 5% w/w hydrocortisone.
weight of ointment is 97 grams
weight of hydrocortisone in 97 grams of ointment is = (%w/w of hydrocortisone * weight of ointment) / 100
which is (5*97)/100 = 4.85 grams
4.85 grams of hydrocortisone present in 97 grams of ointment.
weight of pure hydrocortisone added is 6 grams.
Total weight of hydrocortisone in ointment after addition is 6 + 4.85 = 10.85 grams
Final weight of ointment is = previous weight + weight or hydrocortisone added
which is 97 + 6 = 103.
w/w concentration of hydrocortisone after addition is =
( weight of hydrocortisone after addition * 100 )/ total final weight of ointment
which is (10.85 * 100)/103 = 10.53 % w/w which on rounding to one decimal point becomes 10.5
The final concentration of hydrocortisone is 10.5 % w/w
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