NCLEX-RN Exam Practice

Category - Patient Care

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You are preparing to give potassium chloride 30 mEq in 1000 ml of normal saline over 10 hours. The medication label reads 40 mEq per 20 mL. How many milliliters of potassium chloride do you need to administer the correct dose?

10 mL
15 mL
20 mL
50 mL

Explanation

Answer: B - The nurse would prepare 15 ml of potassium chloride.

desired dose: 30 mEq
available concentration: 40 mEq (units) per 20 mL (volume)

(desired dose ÷ available concentration (units)) × available concentration (volume) = mL per desired dose
(30 mEq ÷ 40 mEq) × 20 mL = 0.75 × 20 mL = 15 mL

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