Question

As part of formulation development, you have been asked to prepare 467 grams of an ointment that contains 7.5% w /w methyl salicylate. Calculate how many grams of an ointment base you would need to prepare the ointment.

Answer 1

The mass of methyl salicylate equals:

$467\times0.075 = 35g$

Therefore, the mass of an ointment base equals

$467-35= 432g$

Answer: 432 g