|
Correct Answer: burette
when tasked with delivering a precise volume of liquid in a laboratory setting, choosing the right equipment is crucial for accuracy and reliability. among the options listed—beaker, burette, pipette bulb, and erlenmeyer flask—the most suitable choice is the burette.
burettes are specifically designed for dispensing set volumes of a solution and are essential for tasks requiring high precision, such as titrations in analytical chemistry. this equipment is generally more accurate than beakers, erlenmeyer flasks, and even graduated cylinders. the design of a burette includes a long, graduated glass tube with a stopcock at the bottom to control the flow of liquid. the graduations are typically very fine, allowing for more precise measurements.
the use of a burette is particularly advantageous in procedures like acid-base titrations, where the exact amount of a titrant must be added to a known volume of analyte to reach a specific endpoint. this is evidenced by the graduations on the burette, which are read from top to bottom, allowing the user to determine the volume of liquid dispensed as it decreases. this precise control is not as easily achieved with other laboratory vessels like beakers or erlenmeyer flasks, which are better suited for mixing or heating chemicals rather than measuring precise volumes.
in summary, for delivering a very specific amount of liquid, the burette is the preferred instrument due to its precise graduation and control features. other tools like beakers and flasks provide more general uses and lack the precision required for detailed measurement tasks such as those found in quantitative chemical analysis.
|
