Which dissolved solvent dissolves graphite


Many substances dissolve in water and other liquids. This results in solutions in which the dissolved substance is so largely distributed (dispersed) that only single molecules or ions of it and no more molecules or. Ionic associations are present in the space of the solvent. This is the case, for example, with aqueous solutions of sugar, hydrogen chloride and sodium chloride. The named and countless other substances are molecularly or ionically distributed in solution, they form real solutions. The diameter of such particles in real solutions naturally depends on the size of the particular type of particle present and is approximately between 100 and 2000 to 3000 μm (100 μm = 0.1 nm = 10−8 cm). Such solutions show characteristics that are due to the extremely extensive distribution (dispersion) of the dissolved substance: The small particles of the dissolved substance are completely invisible even through the sharpest microscope; they are not retained by the filter paper, but penetrate through it like the solvent; they are in the most lively Brownian molecular movement, give the solution an osmotic pressure and cause a boiling point increase and a lowering of the freezing point compared to the pure solvent (see Sections 7.3.2 and 7.3.3).

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© Springer-Verlag Berlin Heidelberg 1977

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