John Burgess wrote:
> anhydrous OA has a molecular weight of 45 and the dihydrate 63.
My handbook of Chemistry and Physics list OA's molecular weight as
90.04. It is ethanedoic acid, HO2CCO2H or 2 carbon (24), 2 Hydrogen (2)
and 4 Oxygen (64) which gives you 90.
Formic acid is about 45, so maybe you are thinking about it instead?
Plus, if you add 2 water molecules you would get a MW of 45+36=71 for OA
dihydrate (but the dihydrate is listed as 126, which makes sense 90+36).
Bill Truesdell
Bath, Maine
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