2. If droplets are seen among the liquid residue in the flask after evaporation (Figure 5.73), most likely water was not effectively removed from the sample prior to evaporation. To remedy this problem, dissolve the sample is a portion of the previously used solvent, use a drying agent (e.g. anhydrous $$\ce{MgSO_4}$$), filter if necessary, and again evaporate the solvent.