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Osmotic concentration: Product of the osmolality and the mass density of water.Īnd theoretically for fundamental terms like this the IUPAC "Gold Book" Compendium of Chemical Terminology should be viewed as the definitive source, as it is literally their job to define such terms, but the word osmolarity still keeps showing up in textbooks, exams, scientific papers, in the published disagreements of professors and the casual plagiarism of textbook authors. IUPAC have been trying to kill this word since 1997, as they would prefer for us to use the term "osmotic concentration": Osmolarity was "called "osmolarity" because "molarity" was formerly used for substance concentration" (Siggaard-Andersen et al, 1981). for sodium chloride the osmolarity will be doubled. For substances which do not dissociate, the molarity and the osmolarity will be the same, whereas for substances that are ionised the osmolarity will be the molarity multiplied by the number of dissociated parts, eg. An osmole is the amount of substance that must be dissolved in order to produce an Avogadro's number of particles (6.0221 × 10 23). this is a colligative property.įor this reason, the term osmoles is used to measure this property, as it refers to the osmotic activity of a solute concentration. it specifically refers to the number of dissolved particles without regard for what kind of particles they are, i.e.it a measurement of something in a volume, and.The most important part of this concept to internalise is that The concentration of a solution expressed as the total number of solute particles per litre.
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The measure of solute concentration per unit volume of solution Also, there is no way one could be exploring these topics without starting from or finishing with Osmolarity Caon (2008) is probably the best, most comprehensive overview, written in an accessible language. Still, if reading extensively about things is what one compulsively does, there are some good resources for this subject.