Method for determining whether reconstitution of a solution in a container is completed, the method comprising the steps of: - selecting a predetermined amount of a solid substance and a predetermined amount of a liquid solvent from which the reconstituted solution is to be prepared, the predetermined amount of the solid substance and of the liquid solvent being selected such that the reconstituted solution is below its saturation limit, - preparing a solution by solving in the container the predetermined amount of the solid substance in the predetermined amount of the liquid solvent, - measuring a value chosen from impedance or resistance of the solution in the container, - determining whether a change of the measured value within a measuring time interval of a predetermined duration is below a defined threshold, - determining that reconstitution of the solution is completed and that the reconstituted solution is formed when the change of the measured value within the measuring time interval of the predetermined duration is below the defined threshold, - determining a reconstitution time (t R) of the solution in the container to be the duration between the time of starting to prepare the solution and the time at which the change of the measured impedance or resistance of the solution is below the defined threshold within the measuring time interval of the predetermined duration, - before determining the reconstitution time (t R) of the solution prepared from the predetermined amount of the solid substance and the predetermined amount of the liquid solvent, measuring the impedances or resistances of a plurality of reconstituted solutions prepared from the same solid substance and the same liquid solvent, the individual reconstituted solutions of the plurality of reconstituted solutions having different concentrations of the solid substance solved in the respective individual reconstituted solution, - from the measurement of the impedances or resistances of the plurality of reconstituted solutions determining a relationship between the impedance or the resistance and the concentration (c) of the solid substance solved in this solution, and - determining the dissolution behavior over time during solving the predetermined amount of the solid substance in the predetermined amount of liquid solvent by assigning the respective measured impedance or resistance of the solution to the respective concentration (c) in accordance with the determined relationship between the impedance or resistance and the concentration (c) of the solid substance solved in the solution. - selecting a predetermined amount of a solid substance and a predetermined amount of a liquid solvent from which the reconstituted solution is to be prepared, the predetermined amount of the solid substance and of the liquid solvent being selected such that the reconstituted solution is below its saturation limit, - preparing a solution by solving in the container the predetermined amount of the solid substance in the predetermined amount of the liquid solvent, - measuring a value chosen from impedance or resistance of the solution in the container, - determining whether a change of the measured value within a measuring time interval of a predetermined duration is below a defined threshold, - determining that reconstitution of the solution is completed and that the reconstituted solution is formed when the change of the measured value within the measuring time interval of the predetermined duration is below the defined threshold, - determining a reconstitution time (t R) of the solution in the container to be the duration between the time of starting to prepare the solution and the time at which the change of the measured impedance or resistance of the solution is below the defined threshold within the measuring time interval of the predetermined duration, - before determining the reconstitution time (t R) of the solution prepared from the predetermined amount of the solid substance and the predetermined amount of the liquid solvent, measuring the impedances or resistances of a plurality of reconstituted solutions prepared from the same solid substance and the same liquid solvent, the individual reconstituted solutions of the plurality of reconstituted solutions having different concentrations of the solid substance solved in the respective individual reconstituted solution, - from the measurement of the impedances or resistances of the plurality of reconstituted solutions determining a relationship between the impedance or the resistance and the concentration (c) of the solid substance solved in this solution, and - determining the dissolution behavior over time during solving the predetermined amount of the solid substance in the predetermined amount of liquid solvent by assigning the respective measured impedance or resistance of the solution to the respective concentration (c) in accordance with the determined relationship between the impedance or resistance and the concentration (c) of the solid substance solved in the solution.