The physical properties of oxalic acid may be of interest in this
connection. The stuff one buys is usually oxalic acid dihydrate, which is a
crystal which has two water molecules attached to each oxalic acid molecule.
The CRC Handbook of Chemistry and Physics gives the following properties
for oxalic acid dihydrate:
On heating:
1) The water of hydration leaves at 101.5 degrees C. The water boils off
leaving anhydrous oxalic acid crystals.
2) At 157 degrees C the oxalic acid starts to sublime (goes directly from
solid to gas)
3) At 189 degrees C the oxalic acid which has not yet sublimed decomposes to
formic acid and carbon monoxide.
Best regards
Donald Aitken
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