NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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Prepare for the NAPLEX (North American Pharmacist Licensure Examination) Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

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Which formula represents the calculation for milliequivalents (mEq)?

mg/MW
g/MW
(mg x valence) / MW or mmols x valence
E = (58.5)(i) / (MW of drug)(1.8)

The correct answer is: (mg x valence) / MW or mmols x valence

The formula for mEq calculates the number of ions in a solution. However, options A and B do not include a value for valence, which is the number of electrical charges carried by the ion. Without including valence, the calculation will not accurately reflect the number of ions present in the solution. Option D is specific to the electrolyte potassium, so it may not be applicable to all substances. Option C, on the other hand, accounts for both the mass and valence of the ion, making it the most accurate formula for calculating mEq.