Abstract
CONGO red and similar salts in aqueous solution cannot diffuse through an ordinary dialysing membrane. When the osmotic pressure is directly measured by an osmometer it is found to be about that which the kinetic theory would ascribe to the salt present if the molecules were completely unionised.
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HARDY, W. The Osmotic Pressure of Colloidal Salts. Nature 86, 584–585 (1911). https://doi.org/10.1038/086584c0
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DOI: https://doi.org/10.1038/086584c0
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