oxalic
Adjective
Meaning
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 dictionarySynonyms
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A calculated titration curve for oxalic acid is shown at the right.
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.
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.
It is said (though no authority is cited) that the magnesium of the nigari binds with the oxalic acid thus mitigating its hazard.
Organic Brønsted acids, such as acetic, citric, or oxalic acid, are not Lewis acids.
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.