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Calcium Oxalate

Calcium oxalate, with the chemical formula \(\text{CaC}_2\text{O}_4\), is a chemical compound that plays a significant role in various biological and environmental processes. It is the calcium salt of oxalic acid and is known for its involvement in the formation of kidney stones when present in high concentrations in the human body. This compound appears as colorless or white crystals and is found in both anhydrous and hydrated forms. The monohydrate form of calcium oxalate, in particular, has a molar mass of 128.096 g/mol and a density of 2.20 g/cm³. It is highly insoluble in water, which contributes to its ability to form kidney stones under certain conditions[3].

Chemical Properties

Calcium oxalate occurs naturally in many plants, where it plays a role in the detoxification of calcium. It is found in the form of insoluble calcium oxalate crystals in plant roots, stems, and leaves. These crystals can cause discomfort if consumed in large quantities due to their sharp structure. The compound is also involved in the formation of soil nutrient calcium carbonate (\(\text{CaCO}_3\)) upon decomposition by fungi, bacteria, or wildfire[3].

Formation of Kidney Stones

Calcium oxalate is a major constituent of kidney stones, which are hard mineral deposits formed in the kidneys. These stones can cause severe pain and urinary tract complications. The formation of kidney stones is often associated with high levels of calcium oxalate in the urine, which can crystallize and form stones when the concentration is high enough or when urine volume is too low[3].

Sources of Calcium Oxalate

Diet plays a significant role in the levels of oxalate in the body. Foods high in oxalate include spinach, rhubarb, nuts, and wheat bran, among others. Consuming these foods in large quantities can increase the risk of kidney stone formation in susceptible individuals[3].

In summary, calcium oxalate is a chemically significant compound with notable implications for human health, particularly in the formation of kidney stones. Its insolubility in water and basic nature in aqueous solutions are key aspects of its chemical properties.

Citations:

[1] https://pubchem.ncbi.nlm.nih.gov/compound/Calcium-oxalate

[2] https://www.sciencedirect.com/topics/chemistry/calcium-oxalate

[3] https://www.turito.com/blog/chemistry/calcium-oxalate

[4] https://pubs.acs.org/doi/10.1021/acsomega.1c03938

[5] https://www.americanelements.com/calcium-oxalate-563-72-4

[6] https://pubchem.ncbi.nlm.nih.gov/compound/Calcium-Oxalate-Monohydrate

[7] https://foodb.ca/compounds/FDB003577

[8] https://www.chemicalbook.com/ChemicalProductProperty_EN_CB7349915.htm