A pharmacist is asked to compound the following formula for the
preparation of 100 capsules:3
Estriol 200 mg
Estrone 25 mg Estradiol 25 mg
Methocel E4M 10 g
Lactose 23.75 g
Using a balance that has an SR of 6 mg, the aliquot method of weighing, lactose as the diluent, and an error in weighing of 4%, show, by calculations, how the correct
quantity of estrone can be obtained to accurately compound the formula.