Stockløsninger

Stockløsninger, often translated as stock solutions or standard solutions, are chemical solutions of a precisely known concentration. They are prepared by dissolving a specific mass of a pure substance, the solute, in a precise volume of a solvent, typically water. The accuracy of the concentration is paramount for their use in quantitative chemical analysis.

The preparation of stock solutions involves meticulous weighing of the solute using an analytical balance and dissolving it in a volumetric flask, which is designed to contain a very specific volume when filled to a calibration mark. This ensures the final concentration is known with high precision. Stock solutions are fundamental in laboratories for various applications, including calibration curves, titrations, and serial dilutions.

By having a well-characterized stock solution, chemists can create working solutions of lower concentrations by diluting the stock. This process of serial dilution is also carefully controlled using volumetric glassware to maintain accuracy. Stock solutions have a long shelf life if stored properly, preventing degradation and evaporation. Their use simplifies laboratory procedures, reduces the time and resources needed for preparing solutions repeatedly, and enhances the reliability of experimental results in fields ranging from environmental monitoring to pharmaceutical development.