Adjective
Pertaining to, derived from, or contained in, sorrel, or oxalis; specifically, designating an acid found in, and characteristic of, oxalis, and also certain plant of the Buckwheat family.
Source: Webster's dictionaryA calculated titration curve for oxalic acid is shown at the right. Source: Internet
Oxalic acid is present in tomatoes, spinach, and especially in carambola and rhubarb ; rhubarb leaves and unripe carambolas are toxic because of high concentrations of oxalic acid. Source: Internet
Other sources give a much higher oral LD Lo (lowest published lethal dose) of 600 mg/kg. citation While the oxalic acid content of rhubarb leaves can vary, a typical value is about 0.5%, GW Pucher, AJ Wakeman, HB Vickery. Source: Internet
It is said (though no authority is cited) that the magnesium of the nigari binds with the oxalic acid thus mitigating its hazard. Source: Internet
Organic Brønsted acids, such as acetic, citric, or oxalic acid, are not Lewis acids. Source: Internet
This is safe in small amounts but potentially toxic in large quantities due to the prevalence of oxalic acid in the tissues Laferrière, Joseph E. 1990. Source: Internet