Question

which piece of lab equipment would be best to measure 13.7 ml of liquid ethanol?
○ 25 ml beaker
○ 25 ml volumetric flask
○ 25 ml erlenmeyer flask
○ 25 ml graduated cylinder

Explanation:

To measure 13.7 mL of liquid ethanol, we need to consider the precision and purpose of each lab equipment:

• A 25 mL beaker is used for holding or mixing liquids, not for precise measurement.
• A 25 mL volumetric flask is used to prepare solutions of a specific volume (e.g., 25 mL exactly), not for measuring out a specific amount like 13.7 mL.
• A 25 mL Erlenmeyer flask is also for holding, mixing, or heating, not precise measurement.
• A 25 mL graduated cylinder is designed for measuring out variable volumes of liquid with reasonable precision, making it suitable for measuring 13.7 mL.

Answer:

D. 25 mL graduated cylinder