A hospital pharmacist receives a medication order calling for 10 mEq of calcium to be added to a 500-mL bag of normal saline solution. The intravenous fluid is to be administered at a rate of 0.5 mEq of calcium per hour. The pharmacist has available 10-mL vials of a 10% injection of calcium chloride dihydrate. (a) How many milliliters of this injection should be added to the bag of IV fluid to make the desired product? (b) If the nurse administering the IV fluid uses an intravenous set that delivers 12 drops/mL, how many drops per minute should be delivered to provide the desired dose?