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Calcium, strontium and Barium form white precipitates of their oxalates with C2O4-2 ions.
The net ionic equation for the formation of calcium oxalate is Ca^2+(aq) + C2O4^2-(aq) -> CaC2O4(s). It represents the reaction of calcium ions and oxalate ions to form the insoluble salt calcium oxalate.
Sulfuric acid is used in titration of oxalate ion as it reacts with oxalate ion to form a white precipitate of calcium oxalate, which makes it easier to detect the end point of the titration. The strong acidity of sulfuric acid also helps in preventing the hydrolysis of the calcium oxalate precipitate.
According to thermogravimetric data from DSC analysis, the first step releases water to form the anhydrous salt but upon further heating this step is followed by an oxidative (disproportionation) decomposition step in which carbon monoxide and calcium carbonate are formed. The third and final step is the decomposition of calcium carbonate to form calcium oxide and carbon dioxide. Because of step 2, good ventilation should be used during decomposition of calcium oxalate.
A kidney stone. There are different types of kidney stones. The exact cause depends on the type of stone.Calcium stones are most common. They occur more often in men than in women, and usually appear between ages 20 - 30. They are likely to come back. Calcium can combine with other substances, such as oxalate (the most common substance), phosphate, or carbonate to form the stone. Oxalate is present in certain foods. Diseases of the small intestine increase the risk of forming calcium oxalate stones.
Calcium phosphate can combine with various ions such as hydroxide, carbonate, and fluoride to form different compounds like hydroxyapatite, calcium carbonate, and calcium fluoride.
Disodium oxalate, often called simply sodium oxalate, is a sodium salt of oxalic acid with the molecular formula Na2C2O4. It is usually a white, crystalline, odorless powder, that decomposes at 250-270 °C.Disodium oxalate can act as a reducing agent, and it may be used as a primary standard for standardizing potassium permanganate (KMnO4) solutions.The mineral form of sodium oxalate is natroxalate. It is only very rarely found and restricted to extremely sodic conditions of ultra-alkaline pegmatites.[1]Contents[hide] 1 Preparation2 Reactions3 Biological activity4 ReferencesPreparationSodium oxalate can be prepared through the neutralization of oxalic acid with NaOH in a 1:2 acid-to-base molar ratio. Half-neutralization can be accomplished with NaOH in a 1:1 ratio which produces NaHC2O4, monobasic sodium oxalate or sodium hydrogenoxalate. ReactionsSodium oxalate is used to standardize potassium permanganate solutions. It is desirable that the temperature of the titration mixture is greater than 60 °C to ensure that all the permanganate added reacts quickly. The kinetics of the reaction is complex, and the manganate(II) ions formed catalyze the further reaction between permanganate and oxalic acid (formed in situ by the addition of excess sulfuric acid). The final equation is as follows:[2]5H2C2O4 + 2KMnO4 + 3H2SO4 → K2SO4 + 2MnSO4 + 10CO2 + 8H2O Biological activityLike several other oxalates, sodium oxalate is toxic to humans. It can cause burning pain in the mouth, throat and stomach, bloody vomiting, headache, muscle cramps, cramps and convulsions, drop in blood pressure, heart failure, shock, coma, and possible death. Mean lethal dose by ingestion of oxalates is 10-15 grams (per MSDS). Sodium oxalate, like citrates, can also be used to remove calcium ions (Ca2+) from blood plasma. It also prevents blood from clotting. Note that by removing calcium ions from the blood, sodium oxalate can impair brain function, and deposit calcium oxalate in the kidneys
Yes, calcium carbonate (not calcium carbon dioxide) can combine with water to form calcite, which is a common mineral form of calcium carbonate. This process usually involves the dissolution of calcium carbonate in water followed by precipitation to form calcite crystals.
When calcium and sulfur combine, they react to form calcium sulfide. This is a chemical compound that is commonly used in the production of metal ores such as zinc and lead.
Accumulation of oxalate in the body can lead to formation of kidney stones, as oxalate binds with calcium to form insoluble crystals. This can result in kidney damage, pain, and urinary tract issues. In severe cases, high oxalate levels can lead to kidney failure.
In its raw form the plant is toxic due to the presence of calcium oxalate, although the toxin is destroyed by cooking.
Calcium, Oxygen and Carbon