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Schematic illustration of the evaporation of HCl and NH3 during drying of the mixed NaCl and (NH4)2SO4 droplet. The top row illustrates the change in droplet composition as RH is decreased, resulting in the evaporation of water, HCl, and NH3. The second row illustrates the composition of the solute. For both rows, the size of the circles qualitatively reflects the remaining water and the number of soluble ions.
