Define precipitate in chemistry how to#
Define precipitate in chemistry free#

The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Erik Gregersen.Titration is a technique used in analytical chemistry to determine the concentration of an unknown solution by using a solution of known concentration. All gravimetric methods are subject to some degree of error because of this difficulty. Obtaining a precipitate that is 100 percent pure and is exactly of the composition represented by a chemical formula is, however, considerably more difficult. In general, the compounds that are precipitated are very insoluble, and negligible error results from the incompleteness of precipitation. Errors made in gravimetric analyses usually relate to the purity of the isolated constituent.

Define precipitate in chemistry free#

Copper in alloys may be determined by this method as long as the sample is free from other metals that plate out under the same conditions. Electrodeposition is used in order to separate certain metals that can be plated out by passing an electric current through a solution of their salts. The gas is absorbed on a weighed quantity of a solid alkaline reagent, and the amount of carbon dioxide is determined from the gain in weight of the absorbent. The sample is treated with an acid, and carbon dioxide is evolved as a gas. Certain substances can be separated by virtue of their easy convertibility into gaseous compounds, as in the determination of carbonate in a mineral analysis. The precipitate obtained is separated by filtration, washed free of soluble impurities, dried or ignited to remove water, and weighed. A reagent is added that forms an insoluble compound with the desired constituent but will not precipitate other constituents of the sample. Of the many methods that may be employed for isolating the desired constituent from a solution of a sample, the most common is precipitation-that is, transformation into a substance not soluble in the solution.

The steps commonly followed in gravimetric analysis are (1) preparation of a solution containing a known weight of the sample, (2) separation of the desired constituent, (3) weighing the isolated constituent, and (4) computation of the amount of the particular constituent in the sample from the observed weight of the isolated substance. Gravimetric analysis, a method of quantitative chemical analysis in which the constituent sought is converted into a substance (of known composition) that can be separated from the sample and weighed. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents EarthвЂ™s To-Do List for the 21st Century.Britannica Beyond WeвЂ™ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.

Define precipitate in chemistry how to#

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