Which instrument is specifically used to prepare solutions of known concentration by delivering a precise final volume?

Which instrument is specifically used to prepare solutions of known concentration by delivering a precise final volume?

• A. Volumetric Flask
• B. Weighing dish
• C. Beaker
• D. Pipette

Answer: (A)

Preparing solutions of known concentration requires a precisely defined final volume. A volumetric flask is designed for this purpose because it has a precisely known capacity and a single calibration mark on the neck. To make a standard solution, you weigh the solute, transfer it to the flask, dissolve it, and then add solvent until the liquid reaches the calibration line. The final volume is exact, so the concentration is known and reproducible. A beaker is for general mixing and rough measurements, with far less precision. A weighing dish is just for weighing solids, not for making solutions. A pipette can transfer a precise volume, but it does not fix the final volume of the solution by itself; the volumetric flask is what sets the exact final volume for an accurate concentration.

Preparing solutions of known concentration requires a precisely defined final volume. A volumetric flask is designed for this purpose because it has a precisely known capacity and a single calibration mark on the neck. To make a standard solution, you weigh the solute, transfer it to the flask, dissolve it, and then add solvent until the liquid reaches the calibration line. The final volume is exact, so the concentration is known and reproducible.

A beaker is for general mixing and rough measurements, with far less precision. A weighing dish is just for weighing solids, not for making solutions. A pipette can transfer a precise volume, but it does not fix the final volume of the solution by itself; the volumetric flask is what sets the exact final volume for an accurate concentration.