If a pharmacist added 12 g of azelaic acid diluent should be used to prepare 8 fluidto 50 g of an ointment containing 15% ounces of the mixture? azelaic acid, what would be the final con - 8. 3 tetracaine centration of azelaic acid in the ointment?

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14 April, 05:05

If a pharmacist added 12 g of azelaic acid diluent should be used to prepare 8 fluidto 50 g of an ointment containing 15% ounces of the mixture? azelaic acid, what would be the final con - 8. 3 tetracaine centration of azelaic acid in the ointment?

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Anne Hanna · Answer 1

Answer is: 31,45%.

mrs₁ (C₉H₁₆O₄ - azelaic acid) = 12g.

mr ₂ (C₉H₁₆O₄) = 50g.

ω₂ (C₉H₁₆O₄) = 15% = 0,15.

mrs₂ (C₉H₁₆O₄) = mr₂·ω₂ = 50g·0,15 = 7,5g.

mrs₃ (C₉H₁₆O₄) = mrs₁ + mr₂ = 12g + 7,5g = 19,5g.

mr₃ = mr₂ + mr₂ = 50g + 12g = 62g.

ω₃ = mrs₃:mr₃ = 19,5g : 62g = 31,45% = 0,3145.