It is not necessary to dry the flask. The flask is partially filled with the solvent. The measured reagent is introduced to the flask. The flask is filled to a point below the neck. The flask is swirled until the solid is fully dissolved.
Additional water is added until the volume is just below the line.
The flask may be swirled for further mixing. The amount of solvent to raise the bottom of the meniscus to the line. The mixture is mixed one more time to ensure a uniform solution and a label applied to the container. A pipet will be used to measure the solution. It may be useful to draw a small amount of solution into the pipet and to discharge this solution into a waste container.