David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Jack Alan Reynolds
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Foundations of Chemistry 7 (1):85-102 (2005)
What, precisely, is `salt'? It is a certainwhite, solid, crystalline, material, alsocalled sodium chloride. Does any of that solidwhite stuff exist in the sea? – Clearly not.One can make salt from sea water easily enough,but that fact does not establish thatsalt, as such, is present in brine. (Paper andink can be made into a novel – but no novelactually exists in a stack of blank paper witha vial of ink close by.) When salt dissolves inwater, what is present is no longer `salt' butrather a collection of hydrated sodium cationsand chloride anions, neither of which isprecisely salt, nor is the collection. Theaqueous material in brine is also significantlydifferent from pure water. Salt may beconsidered to be present in seawater, but onlyin a more or less vague `potential' way.Actually, there is no salt in the sea. In bothancient and modern treatments of otherimportant chemical concepts, including thenotions of `element', related complication,especially polysemy (terms with multiplemeanings), also occurs.In a recent paper, Paul Needham discussed the(predicable) properties of chemical substances,phases, and solutions. He provided a valuablecharacterization of cases in which severalquantities occupy the same space. He alsoconcluded that solution properties are not`intensive', because solvent and solute do nothave parts in common. He tacitly assumed thatingredients are not altered by their inclusionin a solution. This may be the case in somespecial cases (deutero-benzene dissolved inbenzene, say) but is not true in general – andcertainly does not apply to the case of brine,which Needham used as an example – since theions that exist in the solution, and also theaqueous material there, are quite differentfrom the pure ingredients used in making thesolution. An adequate theory of wholes andparts (mereology) must take into account thatwhen individuals enter combinations ofinteresting sorts they no longer are the verysame individuals that existed prior to thecomposition. It appears that no such formaltheory now actually exists.
|Keywords||Philosophy Chemistry/Food Science, general Physical Chemistry Philosophy of Science History|
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Citations of this work BETA
Paul A. Bogaard (2006). After Substance: How Aristotle's Question Still Bears on the Philosophy of Chemistry. Philosophy of Science 73 (5):853-863.
Patrick Toner (2008). Emergent Substance. Philosophical Studies 141 (3):281 - 297.
Michael Weisberg & Paul Needham (2010). Matter, Structure, and Change: Aspects of the Philosophy of Chemistry. Philosophy Compass 5 (10):927-937.
Rom Harré (2009). The Siren Song of Substantivalism. Journal for the Theory of Social Behaviour 39 (4):466-473.
Rom Harré & Jean-Pierre Llored (2013). Molecules and Mereology. Foundations of Chemistry 15 (2):127-144.
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