The healthcare provider prescribes potassium chloride 25 mEq in 500 ml D5W to infuse over 6 hours. The available 20 ml vial of potassium chloride is labeled, "10 mEq/5ml." How many ml of potassium chloride should the nurse add to the IV fluid? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
A) 10 ml
B) 12.5 ml
C) 15 ml
D) 20 ml
