Volumenflasker

Volumenflasker, also known as volumetric flasks, are laboratory instruments used to prepare solutions of precise volume. They are characterized by a pear-shaped bulb with a long, narrow neck. A single calibration mark is etched onto the neck, indicating the precise volume the flask is designed to hold when filled to that mark. The design minimizes errors associated with volume changes due to temperature fluctuations, as the expansion of the liquid is primarily influenced by the volume of the liquid itself rather than the flask.

These flasks are typically made of glass, often borosilicate glass for its resistance to thermal shock and chemical inertness. They come in various sizes, ranging from a few milliliters to several liters. The accuracy of a volumetric flask is high, making them essential for quantitative chemical analysis, such as titrations and the preparation of standard solutions. When preparing a solution, the solute is first placed in the flask, and then a solvent is added to dissolve it. Finally, more solvent is carefully added until the bottom of the meniscus aligns exactly with the calibration mark on the neck. For accurate results, it's important to ensure the flask is clean and dry before use and to temper it to room temperature if significant heating or cooling has occurred during the preparation process.