By H. N. Wilson
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The precipitates are bulky and virtually insoluble, so quite small quantities of the relevant elements can easily be handled. As the precipitates are always contaminated by the reagent, they must be ignited before being weighed. Besides its use as a gravimetric reagent, as both the reagent and most of its compounds are readily soluble in organic solvents such as chloroform, or esters, very small amounts of the metals that combine with it can be removed from aqueous solution of the correct acidity by extraction with a chloroform solution of the reagent.
Colloidal precipitates are usually even less pure than crystalline, partly through entanglement of mother liquor, partly through adsorption on the very large surfaces that they present, and also because the particles carry an electric charge and attract ions or molecules of opposite polarity. The practising analyst may be quite sure what he means by crystalline precipitates, and have general ideas about the less well defined properties of colloids, but he will find that numbers of precipitates seem to fall between the two classes.
38 ORGANIC ANALYSIS 39 Microanalysis also, though dating from about 1 9 1 0 , is such a vast subject that it is given a chapter to itself. GENERAL ORGANIC ANALYSIS As organic analysis grew to keep pace with the increasing demands of the growing science of organic chemistry, dozens of the recently discovered reactions were applied to analysis, but most of them had only qualitative value. For example, it is not difficult to prepare the characteristic osazones of sugars, recrystallize them and determine the melting point and crystalline habit, thus identifying the sugar, but it is not feasible in most cases to carry out the preparation quantitatively.