What should be the burette pump setting (in mL/h) to administer 50 mL of fluid containing 0.5 g of potassium chloride over 30 minutes?

What should be the burette pump setting (in mL/h) to administer 50 mL of fluid containing 0.5 g of potassium chloride over 30 minutes?

• A. 60 mL/h
• B. 100 mL/h
• C. 120 mL/h
• D. 90 mL/h

Answer: (B)

Infusion rate is volume divided by time. You need to deliver 50 mL over 30 minutes. Convert 30 minutes to hours: 0.5 hours. So the rate = 50 mL ÷ 0.5 h = 100 mL per hour. Set the burette pump to 100 mL/h to deliver the full 50 mL in 30 minutes. The amount of potassium chloride (0.5 g) doesn’t affect the flow rate here; it would matter only for concentration or dose calculations, not for the timing. If you used 60 mL/h, you’d deliver 30 mL in 30 minutes; at 120 mL/h you’d deliver 60 mL; at 90 mL/h you’d deliver 45 mL. Only 100 mL/h matches the desired 50 mL in 0.5 hours.

Infusion rate is volume divided by time. You need to deliver 50 mL over 30 minutes. Convert 30 minutes to hours: 0.5 hours. So the rate = 50 mL ÷ 0.5 h = 100 mL per hour. Set the burette pump to 100 mL/h to deliver the full 50 mL in 30 minutes. The amount of potassium chloride (0.5 g) doesn’t affect the flow rate here; it would matter only for concentration or dose calculations, not for the timing. If you used 60 mL/h, you’d deliver 30 mL in 30 minutes; at 120 mL/h you’d deliver 60 mL; at 90 mL/h you’d deliver 45 mL. Only 100 mL/h matches the desired 50 mL in 0.5 hours.