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Lead(II) oxalate

Lead(II) oxalate is an organic compound with the formula PbC2O4. It is naturally found as a heavy white solid.

Preparation

This compound is commercially available. It may be prepared by the metathesis reaction between lead(II) nitrate and sodium oxalate:

:Pb2+(aq) + C2O42− → PbC2O4 (s)

A dihydrate may be formed with water solutions. But the dihydrate dehydrates in air:

:(PbC2O4•2H2O (s) → (PbC2O4 (s) + 2H2O (g)

The trihydrate (PbC2O4•3H2O) can be made by reacting a solution of lead(II) carbonate in perchloric acid with oxalylhydroxamic acid.

Properties

As well as an anhydrous form, a monohydrate (PbC2O4•H2O),

The trihydrate has triclinic crystals with space group P and unit cell dimensions and angles: a = 6.008 Å, b=6.671 Å, c=8.493 Å, α=74.70°, β=74.33°, and γ=80.98°. The unit cell volume is 314.41 Å3 with two formula per unit cell. Density is 3.69 g/cm3.

Solubility

Lead(II) oxalate is insoluble in water. Its solubility is increased in presence of excess oxalate anions, due to the formation of the Pb(C2O4)22− complex ion.

References

References

  1. "Lead(II) Oxalate". Chemistry Reference. http://www.chemistry-reference.com/q_compounds.asp?CAS=814-93-7.
  2. "Lead Oxalate". American Elements: The World's Manufacturer of Engineered & Advanced Materials http://www.americanelements.com/pboxl.html.
  3. Grases, F.. (1993). "Studies on Lead Oxalate Crystalline Growth". Journal of Colloid and Interface Science.
  4. (15 November 1993). "Structure of lead(II) oxalate dihydrate". Acta Crystallographica Section C: Crystal Structure Communications.
  5. (April 1990). "Crystal structures of isomorphous cadmium(II) and lead(II) oxalate trihydrates". Journal of Crystallographic and Spectroscopic Research.
  6. Kolthoff, I.M.. (1942). "The Solubility of lead Sulfate and of Lead Oxalate in Various Media". Journal of Physical Chemistry.
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