Trying to use oxalate complexation to separate Fe from Co.  Theory: Fe(III) oxalate is sluble, Fe(II) is insoluble (yellow) and Co(II) oxalate is insoluble (light yellowish pink).

Added to [FOX1] 1.5 g NaHSO4.  Turned pale yellow almost clear, pH 1.5.

Prepared [FOX2]: 1.00 g CoSO4.yH2O + 30 mm H2O.  Orangish pink clear sol.

Prep [FOX3]: 1.00 g Na2C2O4.zH2O + 40 mm H2O.  Clear, but left undissolved ppt at bottom.

Prep [FOX13]: 1 mL [FOX1] + 2 mL [FOX3]. Changed from very light clear yellow to clear yellow.

Prep [FOX23]: 1 mL [FOX2] + 2 mL [FOX3]. Changed from clear pink to clear white + pinkish white ppt.  

Added 1 g NaHSO4 to [FOX2] to incease acidity. pH 1.5. Still clear pink. 

Prep [FOX23']: 1 mL [FOX2] (with the extra NaHSO4) + 2 mL [FOX3]. Same as [FOX23]: clear white liq, pinkish white ppt.

Prep [FOX123]: 1 mL [FOX1] + 1 mL [FOX2].  Result clear tangerine liq. Added 6 mL [FOX3].  Right away, just clear golden yellow liq, no ppt! 8-(  However, ppt started to form after a couple of minutes.  After an hour, clear yellow liq + pink white ppt! 8-)
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