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9 January, 13:06

The pharmacy receives a prescription for 50 grams of 5% salicylic acid ointment. the pharmacy has a 30% salicylic acid ointment and petrolatum available. using only these products, how much petrolatum should be used to compound the prescription? express the answer in grams. (answer must be numeric; no units or commas; include leading zero when answer is less than 1; round the final answer to the nearest one decimal place.)

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  1. 9 January, 14:15
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    In this problem, we can formulate two equations.

    First, the overall mass balance of the ointment. The mass of 30% salicylic acid ointment plus the mass of petrolatum must be 50 grams.

    x + p = 50

    Where x is the mass of 30% salicylic acid ointment and p is the mass of petrolatum

    Second, the component mass balance of salicylic acid:

    0.3 * x = 50 * 0.05

    x = 8.33 g

    Therefore the mass of petrolatum to be used is:

    x + p = 50

    p = 50 - x

    p = 50 - 8.33

    p = 41.67 g

    Answer:

    41.7
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