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Natural Science Forum / Chemistry / Organic Synthesis / July 2005some old terms
Hi Everyone, In a paper from 1904 in German, there were some units I could not figure out. 1) 12 Be- (- was on top of the e) 2) 1/n NaOH I geuss Be- is unit of degree and 1/n measns 1 or 0.1 normal concentration. Does anyone have an idea on these? Appreciate your reply in advance! Porphyrin YoungYou@gmail.com a ?crit dans le message ... >Hi Everyone, > [quoted text clipped - 10 lines] > >Porphyrin B? is likely a reference to the Baum? hydrometer scale. There are two kinds of use, heavy B? and light B? . On the light scale 0? B? is equal to the gravity of a 10% solution of NaCL. I would asume also that 1/n NaOH would be 0.1N JOL > Hi Everyone, > > In a paper from 1904 in German, there were some units I could not > figure out. > 1) 12 Be- (- was on top of the e) "B?" it's the symbol of "Baum? degrees". You can found others info (and also formulas for the conversion between B? and density here: http://antoine.frostburg.edu/chem/senese/101/measurement/faq/baume-scale.shtml In Europe we use commercially B? degrees yet, i.e. if you buy some NH4OH by a chemist, on the bottle you can read "10 B?" and not the concentration or the specific gravity! > 2) 1/n NaOH > 1/n measns 1 or 0.1 normal concentration. Yes, 1/n it's normal (or molar...for NaOH it's the same if we are speaking about acid properties) concentration write with a fraction and not wit a decimal number. You have simply to transform fraction in decimal number (i.e. 1/2 NaOH = NaOH 0.5N) Bye!  Signature"La sintesi organica ? la chimica che fa Dio quando ha voglia di divertirsi un po'. Se Dio ? un chimico" (A.R.) Albert Ruggi www.chimicavita.cjb.net albert.ruggi@virgilio.it Powered by Linux;-) briefly around that time some people tried to use a standardised version of Degrees Brix (its a measure of density based on sugar solutions usualy used in beer and wine making.) with the idea that this would be more accurate some how, but I thought the germans were smarter than to fall into that trap, the context of use might help you decifer more than my shot in the dark though. |
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