The reversal of "irreversible" hydrosols aggregated by traces of "protective" colloids : (preliminary communication) / by G. Stanley Walpole.

  • Walpole, George Stanley.
Date:
[1913?]
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Licence: Public Domain Mark

Credit: The reversal of "irreversible" hydrosols aggregated by traces of "protective" colloids : (preliminary communication) / by G. Stanley Walpole. Source: Wellcome Collection.

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    Exponents of normality of hydrochloric acid [From the Proceedings of the Physiological Society, October 18, 1913.] Journal Physiology, Vol. XLVII. The reversal of “irreversible” hydrosols aggregated by traces of “protective” colloids. By G. Stanley Walpole. (Preliminary communication.) The observation that an irreversible hydrosol of gold, mastic or oil could be aggregated immediately by a minute trace of albumen, globulin, or gelatine in the presence of hydrochloric acid insufficient m amount to aggregate the sol alone, even after many hours, has led to a further investigation of the phenomenon. The following diagram lepiesents as a typical case the relationship between the concentrations of gelatine and of hydrochloric acid, and the state of aggregation of the particles of a particular oil sol two hours after mixing equal volumes of all three. The negative exponents of the normality of the hydrochloric acid and of the concentration of the gelatine are plotted as ordinates and abscissa3 respectively. The area A BCD includes all points where aggregation of the oil particles takes place. It will be seen at once from the diagram that (1) With pure water all strengths of acid up to 10_2N fail to produce a change. (The actual normality of the acid in the mixture is 10~2,48N since equal volumes of the three constituents are taken, log 3 = -477.) (2) If now 1 in 100,000,000 gelatine be used instead of pure water, aggregation is observed with less acid than is required to produce aggregation using pure water.