Chemistry – Experimental techniques and chemical analysis - Experimental design | e-Consult

A residue is the solid substance that is left behind after a separation process, such as evaporation, distillation, or filtration. It is the component that is not volatile (easily evaporated) or that is physically trapped by a filter. The residue is typically collected and can be further processed or analyzed. For example, after evaporating water from a salt solution, the salt would be the residue. After filtration, the solid particles trapped by the filter paper would be the residue.