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A salt with this anion is sometimes called an acid oxalate, monobasic oxalate, or hydrogen oxalate. The equilibrium constant (K a) for loss of the first proton is 5.37 × 10 −2 (pK a = 1.27). The loss of the second proton, which yields the oxalate ion, has an equilibrium constant of 5.25 × 10 −5 (pK a = 4.28).
Sodium oxalate, or disodium oxalate, is a chemical compound with the chemical formula Na 2 C 2 O 4. It is the sodium salt of oxalic acid. It contains sodium cations Na + and oxalate anions C 2 O 2− 4. It is a white, crystalline, odorless solid, that decomposes above 290 °C. [2]
It occurs naturally in many foods. Excessive ingestion of oxalic acid or prolonged skin contact can be dangerous. Oxalic acid has much greater acid strength than acetic acid. It is a reducing agent [9] and its conjugate bases hydrogen oxalate (HC 2 O − 4) and oxalate (C 2 O 2− 4) are chelating agents for metal cations.
It is one of the most common salts of the hydrogenoxalate anion, and can be obtained by reacting potassium hydroxide with oxalic acid in 1:1 mole ratio. The salt is also known as: potassium hydrogen oxalate , potassium bioxalate , acid potassium oxalate , or monobasic potassium oxalate .
Niobium(V) can form complexes with hydroxy acids, as well as oxalic acid. The salt formed is more complex than tartaric acid for niobium (as opposed to tantalum). [3] NH 4 [NbO(C 2 O 4) 2 (H 2 O) 2]·3H 2 O starts to lose water at 125°C, and at 630°C, it fully decomposes, forming a compound known as niobium pentoxide; [4] Heating this complex and sodium citrate at 650°C can form sodium ...
Structure of hydrated ferric oxalate Color code: red=O, white = H, blue = Fe, gray = C. Room temperature Mössbauer spectrum of Fe 2 (C 2 O 4) 3 ·4H 2 O. According to X-ray crystallography of the tetrahydrate Fe 2 (C 2 O 4) 3 · 4 H 2 O, iron is octahedral. The oxalate ligands are bridging. Some through all four oxygen atoms, some with two ...
It is an ammonium salt of oxalic acid. It consists of ammonium cations ([NH 4] +) and oxalate anions (C 2 O 2− 4). The structure of ammonium oxalate is ([NH 4] +) 2 [C 2 O 4] 2−. Ammonium oxalate sometimes comes as a monohydrate ([NH 4] 2 C 2 O 4 ·H 2 O). It is a colorless or white salt under standard conditions and is odorless and non ...
The compound is a salt consisting of ferrioxalate anions, [Fe(C 2 O 4) 3] 3−, and sodium cations Na +. The anion is a transition metal complex consisting of an iron atom in the +3 oxidation state and three bidentate oxalate ions C 2 O 2− 4 anions serving as ligands.