During an experiment, a student uses a beaker to measure the volume of a weak acid. When the experiment is over, what should she do with the beaker?
A.
Wash the beaker with soap and water.
B.
Wipe the beaker down with a paper towel.
C.
Turn the beaker upside down on a rack to let any remaining acid drip out.
D.
Heat the beaker over a Bunsen burner for at least 10 minutes.
C. Turn the beaker upside down on a rack to let any remaining acid drip out.
C. Turn the beaker upside down on a rack to let any remaining acid drip out.
To answer this question, we need to consider safety practices and proper handling of laboratory equipment.
The correct answer is A. Wash the beaker with soap and water.
Explanation: After using the beaker to measure a weak acid, it is important to clean it thoroughly to remove any residue or contamination. Washing the beaker with soap and water will help remove any remnants of the acid and ensure that it is clean for future use. Using soap will help break down any remaining acid, and rinsing with water will remove it completely.
Option B, wiping the beaker down with a paper towel, may remove visible residue on the surface but may not effectively remove the acid. It is also not a proper cleaning method for laboratory equipment.
Option C, turning the beaker upside down on a rack to let any remaining acid drip out, may allow the acid to evaporate over time, but it does not provide a thorough cleaning.
Option D, heating the beaker over a Bunsen burner for at least 10 minutes, is an incorrect and dangerous choice. Applying heat to the beaker without a specific purpose can damage the beaker or cause it to break, which could lead to accidents or injuries.
Overall, it is best practice to wash laboratory equipment, including beakers, with soap and water after use to maintain cleanliness and prevent cross-contamination.