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How much (in grams) of salicylic acid should be added to 75 g of a polyethylene glycol ointment to prepare an ointment containing 6% w/w of salicylic acid?

Accepted Answer

To prepare a 6% w/w salicylic acid ointment, you need 4.5 grams of salicylic acid. Here's how to calculate that:

Desired concentration: 6% w/w means 6 grams of salicylic acid per 100 grams of ointment.
Ointment base weight: You have 75 grams of polyethylene glycol ointment.
Salicylic acid needed: (6 g salicylic acid / 100 g ointment)
75 g ointment = 4.5 g salicylic acid

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