To indicate when the vaporization temperature of the medium being distilled has been reached.
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The thermometer in a distillation setup is typically placed above the mixture to measure the temperature of the vapor being produced during distillation. This allows for control over the distillation process by providing information on when different components are vaporizing and condensing. Placing it directly in the mixture could interfere with accurate temperature readings and risk contaminating the thermometer.
Electrolysis is a process, fractional distillation another.
The solid material left behind in the distillation process would typically be found in the distillation flask or boiling flask after the distillation is complete. This solid residue results from the separation of components in the mixture and is often referred to as the distillation residue or distillation bottoms.
A thermometer is needed when separating crude oil to monitor and control temperatures during distillation. Different components of crude oil have different boiling points, so heating the crude oil to specific temperatures allows for the separation of various fractions more efficiently. This helps to ensure that each component is collected at the appropriate stage of the distillation process.
Distillation requires a mixture of liquids with different boiling points, a distillation apparatus (such as a distillation flask and condenser), and a heat source. The process involves heating the mixture to vaporize the more volatile component, then cooling and condensing the vapor to collect the purified liquid.