By B. Straumanis, M.E. Jirgensons

ISBN-10: 0080096018

ISBN-13: 9780080096018

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Extra info for A Short Textbook of Colloid Chemistry

Example text

1 0 and 7 - 0 . 1 0 ; the average of 5-91 . 1 0 is still closer to the recent most probable figure. This agreement is of great importance for the kinetic theory. The conclusions drawn from these experiments gave the most convincing support to the concept of the real existence of molecules, an idea that was doubted at that time even by some prominent chemists, among them Wi. OSTWALD. These findings concerning Brownian movement were so convincing that OSTWALD abandoned his former scepticism, and admitted the real existence of molecules.

The colloids like Ag-sol and ferric hydroxide, which are easily flocculated by electrolytes, are lyophobic or hydrophobic. The hydrophilic sols of albumin or gelatin, however, are stable toward electrolytes, but are flocculated by alcohol. The coagulation problem will be thoroughly treated in several later chapters. However, having the three hydrophobic sols on hand we are able to perform quite easily some very instructive experiments. If instead of sodium chloride we use amounts of 0-1 Ν calcium chloride equal to the volume of each sol to flocculate the colloids, we find that silver and arsenious sulphide will coagulate easily, but that ferric hydroxide is unaffected.

Experimentally much simpler is the porous disc method of NORTHROP and ANSON the sol is separated from the solvent by a sintered glass disc in which occurs the concentration gradient. The diffusion is measured by taking samples of the solvent in which the amount of substance in question is then determined analytically (Fig. 10). The diffusion rate can also be estimated by observations with a microscope, an ultra-microscope, or with a n ultra-centrifuge (pp. 167— 174). F Ü R T H has proposed a micromethod which has proved to be very useful in diffusion experiments with dyes.

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