what is an evaporating dish used for in lab
An evaporating dish or watch glass is a piece of laboratory glassware used for the evaporation of solutions and supernatant liquids,[note 1] and sometimes to their melting point. Evaporating dishes are used to evaporate excess solvents - most commonly water - to produce a concentrated solution or a solid precipitate of the dissolved substance. Most are made of porcelain or borosilicate glass. Shallow glass evaporating dishes are commonly termed watch glasses, since they resemble the front window of a pocket watch.