Concentration Calculations Quizzes

The pharmacist needs to manufacture a 7% ointment using 34 g of a 10% boric acid ointment. How many grams of pure ointment base is required? Round answer to the nearest tenth. Do not include units.

A pharmacist must prepare a parenteral nutrition that includes 650 mL of D70W. If the pharmacy only stocks D50W. How many milliliters of D50W will be needed to provide an equivalent energy requirement? Round answer to the nearest whole number. Do not include units.

In what proportion should a 25% zinc oxide ointment be mixed with white petrolatum to produce a 5% zinc oxide ointment?

If an antibiotic injection contains 8% w/v of the drug, how many milliliters of diluent should be added to 6 mL of the injection to prepare a concentration of 5 mg of the antibiotic per milliliter Round answer to the nearest whole number. Do not include units.

A hospital pharmacist wants to use three lots of zinc oxide ointment containing, respectively, 60%, 30%, and 10% of zinc oxide. In what proportion should they be mixed to prepare a 20% zinc oxide ointment?

There are two dilute stock solutions (1:200 w/v and 1:2000 w/v) that are available in order to prepare 60 mL of a 1:1,000 w/v solution. Determine the volume of the 1:2000 w/v stock solution needed. Round answer to the nearest hundredth. Do not include units.

Dopamine hydrochloride injection is available in 5-mL ampules of 30 mg of dopamine hydrochloride per milliliter. The injection must be diluted to 0.025% w/v of dopamine chloride before administration using sodium chloride injection used as a diluent. How many milliliters of sodium chloride injection should be added to 5 mL of the injection? Round answer to the nearest whole number. Do not include units

If 50 mL of a combination gel of hydrocortisone acetate, 1% w/w, and pramoxide, 1% w/w, are mixed with 14.5 mL of a gel containing hydrocortisone acetate, 3.5% w/w, and pramoxide, 1% w/w, calculate the percentage strength of each of the two drugs in the mixture.

A manufacturing pharmacist wants to mix 40%, 25%, 10%, and 5% zinc oxide ointments to produce a 15% ointment. In what proportions should they be mixed?

How much drug should be used in preparing 125 ml of a solution such that 15 ml diluted to 250 ml will yield a 1:50 solution? Round to the nearest whole number. Do not include units.