Question

1. A dermatologist prescribes Drysol as a treatment for excessive underarm sweating. Drysol contains 15 g of aluminum chloride hexahydrate in 84 mL of an alcohol base.What is the final strength of Drysol? Round to the nearest hundredths (w/v).2.If 8 tablespoons of extract are mixed with distilled water to total 300 mL, what is the final concentration (v/v)?3.If you add 8 g of salicylic acid to 84 g of an ointment base, what is the final concentration (w/w) of the product? Round to the nearest hundredths (w/w).4.You are asked to make 125 grams of a 7% antifungal cream using tolnaftate powder and Eucerin cream. How many grams of tolnaftate powder are needed? Round to the nearest hundredths (w/w).5. If 75 g of active ingredient powder is mixed with 400 mL NS solution, what is the final concentration? Round to the nearest hundredths (w/v).

Answer 1

Answer

Strength of Drysol = (15/99)*100 = 15.2%

Explanation

Given:

mass of aluminum chloride hexahydrate = 15 g

mass of alcohol base = 84 mL

Lets assume the density of alcohol base to be 1 g/mL

Therefore mass of alcohol base = 84 g

Solution:

Total mass of the mixture = 84g + 15g = 99 g

Strength of Drysol = (15/99)*100 = 15.2%