This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...PRECIPITATING ACTION OF ELECTROLYTES ON FERRIC HYDROXIDE HYDROSOL. (16 milli-mols Fe(OH)2 per liter.) The significance of the relation between ionic charge and precipitating power was first pointed out by Hardy, who formulated the following rule: --The precipitation of a colloidal solution is determined by that ion of ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...PRECIPITATING ACTION OF ELECTROLYTES ON FERRIC HYDROXIDE HYDROSOL. (16 milli-mols Fe(OH)2 per liter.) The significance of the relation between ionic charge and precipitating power was first pointed out by Hardy, who formulated the following rule: --The precipitation of a colloidal solution is determined by that ion of an added electrolyte which has an electric charge opposite in sign to that of the colloidal particles. It has already been pointed out that colloidal particles of arsenious sulphide are negatively charged, hence, according to Hardy's rule, the positive ions of the added electrolyte will condition the precipitation of the suspensoid. The experiments of Freundlich confirm this prediction, as is shown by the following table: PRECIPITATING ACTION OF ELECTROLYTES ON ARSENIOUS SULPHIDE HYDROSOL. Precipitation and Valence. An examination of the preceding tables reveals the fact that although the ionic concentration necessary to bring about precipitation, in accordance with Hardy's rule, decreases with increasing valence, the diminution in concentration is not, as we might expect, inversely proportional to the valence of the precipitating ion. The absence of any simple quantitative relation between the valence of an ion and its precipitating con Zeit. phys. Chem., 33, 385 (1900). centration is undoubtedly due to the influence of several potent factors, such as adsorption and the protective action of ions whose electric charge is of the same sign as that of the colloidal substance. Precipitation of Emulsoids. The action of electrolytes on emulsoids is much more obscure than the action of electrolytes on suspensoids. Nothing approaching a generalization similar to Hardy's rule for the precipitation of suspensoids has been found to apply to the precipitat...
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Seller's Description:
Very Good. No Jacket. Book. Inscribed by Author(s) Former library book with no external markings. Tight binding, solid boards with sharp corners, bright gilt lettering to spine strip, Stockbridge Library bookplate to front paste down, pocket and due date card to rear (book was checked out 4 times) author's inscription to library on front end paper signed and dated Oct. 10, 1922. He includes an exerpt from Whittier's Among the Hills, prelude.
