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Chemistry
Calorimetric Theory Discrepancy
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[QUOTE="mjc123, post: 6491572, member: 610180"] A similar question came up in this thread: [URL]https://www.physicsforums.com/threads/molar-enthalpy-change-calorimetry.1002423/[/URL] Googling turned up an obscure old paper from which I estimated (mental arithmetic!) that the SHC of a NaOH solution of that concentration (about twice as concentrated as yours) was ca. 4.03 J/g/K. So total mass*true SHC was slightly lower than water mass*water SHC. But that won't be true for all solutes. My recommendation was to use water mass and water SHC. Unless you've a good idea of the true SHC, this is probably the most reasonable thing to do, at least for dilute solutions. Here's the reference if you're interested: [URL]https://nvlpubs.nist.gov/nistpubs/jres/4/jresv4n2p313_A2b.pdf[/URL] [/QUOTE]
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