Reaction/reduction of calcium oxalate
CaC2O4(calcium oxalate) --->H2O<---Ca 2+(aq)(calcium) + C2O4 2-(aq)(Oxalate, charged form of oxalic acid)
"Oxalic acid has the ability to form a strong bond with various minerals, such as sodium, potassium, magnesium, and calcium. When this occurs, the compounds formed are usually referred to as oxalate salts. Thus, “oxalate” usually refers to a salt of oxalic acid, one of which is calcium oxalate." http://www.vulvarpainfoundation.org/vpfoxalate.htm
"Oxalic acid can also be present in the body due to the consumption of another toxin, ethylene glycol (generally known as automobile antifreeze), because over time, the body metabolizes ethylene glycol partially into oxalic acid. Estimated fatal dose is 5 to 15 grams.
Bodily oxalic acid may also be synthesized via the metabolism of either glyoxylic acid or unused ascorbic acid (vitamin C)," http://www.dewsworld.com/FInDefenseofOxalicAcid.html
"Oxalic acid is a major end product of ascorbic acid
oxidation, and it has the potential to crystallize as calcium
oxalate in the urinary space. An oral dose of 500 mg ascorbic
acid modestly increases urinary oxalic acid excretion and
could theoretically increase the risk of stone formation in
susceptible people" http://www.medicine.mcgill.ca/oncolo...alAcidExcr.pdf
"There is some preliminary evidence that the administration of probiotics can affect oxalic acid excretion rates (and presumably oxalic acid levels as well.)" http://en.wikipedia.org/wiki/Oxalate#cite_note-6
I know not the greatest source but the page linked to http://www.ncbi.nlm.nih.gov/pubmed/16105057
This has some interesting info about Calcium Oxalate http://www.chem.uwec.edu/Chem115_F00...su/project.htm
Oxalic acid can be consumed through plant material. But most of the time its in very small amounts. Ph still plays a part. This is not easy to predict and is only a rough idea of what has to happen. There most likely are some more factors but its late for me and this is what I could quickly find. I am not sure if this helps at all. This may just confuse the heck out of us.