# Last edited on 2017-04-24 03:25:56 by jstolfi

Synthesis of sodium oxalate and sodium hydrogenoxalate
from oxalic acid and sodium hydroxide

See the 00-LIBRETTO and 00-RECIPE

  sodium_oxalate.gawk > 00-RECIPE

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2017-04-23 Sun 

Preparing sodium oxalate Na2C2O4 sample (10g) from oxalic acid H2C2O4
and sodium hydroxide NaOH by the water+water route.

* Used buggy table of H2C2O4 solubilities (10x true values)

* The solubility table of NaOH too may be buggy.  Perhaps the monohydrate?

Reagent solution (A): 10.38 g of H2C2O4(H2O)2, 17.96 g H2O. Dissolved at ~65 C.

Reagent solution (B): 6.27 g NaOH (Asher; monohydrate?), 7.70 g H2O. Dissolved at ~65 C.

Added (A) to (B) with dropper. Quick efervescence, perhaps ebulition,
that quieted down quickly. Fine crystalline ppt formed. Washed (A)
beaker with 1.48 g H2O.

Cooled resulting suspension to ~15 C and filtered. Filtrate (C) was
initially clear. Washed beaker and ppt (D) repeatedly with ethanol
99%, adding the filtrate to (C). The ethanol became cloudy in contact
with (C) and eventually depostied a white ppt too.

Drying ppt at ~100 C

Weight of ppt dry: 9.50 g (expected ~10 g).