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Dean Stark apparatus HTML5


A Dean Stark is a form of glassware used in certain chemical experiments to extract water from a reaction mixture. This apparatus was invented by Ernest W. Dean and David D. Stark in 1920. They described it as "an original method for the determination of the quantity of water and other organic emulsions contained in petroleum".

Learning goals

  • To illustrate what the Dean-Stark apparatus consists of, and how it is used.
  • To illustrate how a Dean Stark apparatus can shift a chemical equilibrium, and so increase the yield of the reaction.
  • To illustrate the separation of water and ester in order to shift an equilibrium point.


Learn more

An ester is an organic compound that is much used in industry (textile fibers, waxes, solvents) notably for their olfactive properties (aromas for the food inductry, perfumes...). The chemical…

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