7) Each gram of an ointment contains 2.5 mg of miconazote nitrate he available i

Question

7) Each gram of an ointment contains 2.5 mg of miconazote nitrate he available in 50-g tubes. Calculate (a) the percent concentration the ointment and (b) the quantity of miconazole nitrate, in grams, ointment. cintment in of mier"2nte nitrate in in ench tube of (2 points to tu Ratio Strength 1: 5,000 w/v dilution of fire ant extract. How many micrograms of extract would be administered in this manner? 8) A skin test for fire ant allergy involves the intradermal skin prick of 0.05 mL of a (2 points) Page 3 of 6

Explanation / Answer

Ans 7

1 g ointment contains = 2.5 mg miconazole nitrate

= 2.5 mg x 1g/1000mg = 0.0025 g

Mass of one tube of ointment = 50 g

Part a

% concentration of miconazole nitrate in ointment

= ( mass of miconazole nitrate / mass of ointment) x 100%

= (0.0025 g / 1 g) x 100%

= 0.25 %

Part b

Mass of miconazole nitrate in each tube

= ( 0.0025 g miconazole nitrate / 1 g ointment) x 50 g ointment

= 0.125 g

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