#### 301. A chemistry lab starts with 1500 mL of a solution. During an experiment, 275 mL evaporates, and then 150 mL is added back. How much solution remains in the lab?

Mon, 04 May 2026 07:17:23 +0000

--- ## How Chemistry Lab Experiments Follow Precise Volume Changes: The Case of #### 301 In schools, research facilities, and industrial labs across the U.S., precise volume measurements form the backbone of scientific accuracy. A recent conversation around a common lab scenario—losing and regaining a solution through evaporation and replenishment—sparks broader curiosity about how small changes impact quantities in controlled environments. The question, “A chemistry lab starts with 1500 mL of a solution. During an experiment, 275 mL evaporates, and then 150 mL is added back. How much solution remains in the lab?” is deceptively simple but reveals fundamental principles of conservation and calculation. This topic is increasingly relevant as hands-on STEM education has surged, especially among curious students and educators exploring real-world applications of measurement, chemistry, and data integrity. ### Why This Lab Scenario Is Trending in U.S. Science Education