Potassium oxalates

Potassium Oxalate. The monohydrate [6487-48-5] K2C204-H20, mol wt 184.24, is produced as a colodess crystalline material or a white powder. The anhydrous salt [583-52-8] mol wt 166.22, is obtained when the monohydrate is dehydrated at 160°C. The monohydrate is preferred as a reagent in analytical chemistry and in miscellaneous uses principally because of its high solubihty as compared with other simple neutral oxalates the saturated solution, at 0°C, contains about 20 wt %, and at 20°C, about 25 wt %... 

Oxalate Acid Number. A metal soap solution is treated with a measured excess of organic acid. Potassium oxalate solution is added to precipitate the metal and the total sample is back-titrated with alkaU to determine its acidity. Acidity is expressed ia acid number units, equivalent to mg KOH per g. A neutral soap gives a 2ero acid number, an acidic soap solution a positive acid number, and a basic soap solution a negative acid number. 

Potassium hydrogen oxalate (H2O) [127-95-7] M 137.1. Crystd from water by dissolving 20g in lOOmL water at 60° containing 4g of potassium oxalate, filtering and allowing to cool to 25°. The crystals, after washing three or four times with water, are allowed to dry in air. 

Chemical Designations-SyTm/Q ffu Potassium oxalate monohydrate Chemical Formula K2d204 H20. Observable Characteristics - Physical State (as normally shipped) Solid Color Colorless White Odor. None. 

Add a little caustic potash solution. Crystals of potassium oxalate are deposited. The ester is hydrolysed. 

Determine whether an aqueous solution of each of the following salts has a pH equal to, greater than, or less than 7. II pH > 7 or pH < 7, write a chemical equation to justify your answer, (a) K,C204, potassium oxalate (b) Ca(NO )2 ... 

The aerial part of sage was successively extracted with water, potassium oxalate, DMSO and KOH, and gave rise to different fractions with bioactivity. Partial purification of the water extract gave rise to a polydisperse fraction called A, that based on the monosaccharide composition, IR, and NMR, was thought to be composed of arabinogalactans associated with the highly ramified rhamnogalacturonans core. Fracfion B, exfracfed wifh oxalate, was... 

Potassium 4-chloro-3,5-dinitrobenzene-sulfonate, 31, 46 Potassium cyanate, 31, 9 Potassium cyanide, 30,84 32,31,63 37,47 Potassium ethyl malonate, 37, 34 Potassium ethyl xanthate, 30, 56 Potassium fluoride, 36, 40 Potassium iodide, 30, 34 31, 31, 66 Potassium metal, 37, 29, 30 Potassium methyl sulfate, 31, 73 Potassium nitrate, 31, 46 Potassium 1-nitropropylnitronate, 37, 24 Potassium oxalate, 34, 83 Potassium permanganate, 30, 87 31, 59 Potassium sulfide, 32, 103 Potassium thiobenzoate, 32, 101 Potassium thiocyanate, 32, 39, 40 Prins reaction, 33, 72 Propane, 1, 3-dibromo-2, 2-Ws-(bromo-methyl)-, 31, 82... 

Blood samples for analysis of volatile organic compounds (VOCs) including hexachloroethane should be collected into containers from which VOC contamination has been reduced (Ashley et al. 1992). Potassium oxalate/sodium fluoride is the recommended anti-coagulant. Blood samples should be placed on ice or refrigerated shortly after collection, and Ashley et al. (1992) recommend that analysis for VOCs be completed within 14 days. 

Chromic phosphate, molecular formula, properties, and uses, 6 563t Chromic potassium oxalate, molecular formula, properties, and uses, 6 563t Chromic potassium sulfate, molecular formula, properties, and uses, 6 563t Chromic sulfate, molecular formula, properties, and uses, 6 563t Chromite, 6 468-469, 471t consumption, 6 490-491 mining and processing, 6 477-481... 

The results of experiments conducted by MacKenzie and McCollum (15) indicate that the effect of dietary oxalic acid on the rat depends on the composition of the diet. There was no effect on rate of growth or calcium excretion of 50 g rats fed for 10 weeks a diet containing 0.6% calcium, 0.7% phosphorus, and optimum vitamin D, when levels of potassium oxalate up to 2.5% were fed. The percent bone ash on the 2.5% oxalate diet was somewhat lower than on the control diet. On a 0.35% calcium, 0.35% phosphorus, and vitamin D-free diet, 1.7% potassium oxalate resulted in restricted growth and bone formation of weanling rats. 

Lovelace et al. (20) noted that the effect of oxalic acid on calcium retention depended on the age of the animal (Figure 4). The two experimental diets contained cod liver oil and 0.3% calcium. Milk was the main source of calcium, and to one diet was added 60 mg of potassium oxalate daily. Ten-day balances were determined throughout the study until rats were 175 days of age. At 50 days of age, rats fed oxalate retained about 25% of the calcium,... 

If the sodium formate is replaced by sodium or potassium oxalate a similar reaction takes place —... 

This kidney stone formed when potassium oxalate precipitated out of solution in a kidney. How can you predict whether a precipitate, such as potassium oxalate, will form in an aqueous solution ... 

Figure 7. EPR absorption derivative spectra of photoreduced active aconitase. Enzyme ( 5 mg/ml) in 100 mM Hepes, pH 7.5, plus 5 pM deazaflavin and 10 mM potassium oxalate was photoreduced in the presence of either A) 10 mM tricarb-allylate, B) 1 mM citrate, or C) 10 mM rrans-aconitate. The numbers above each spectrum are the g-values of prominent features. Experimental conditions for obtaining EPR spectra were 13 K, 1 milliwatt microwave power, 0.8 mT modulation amplitude, and 9.24 GHz microwave frequency.

Oxalate does not interfere with glucose assays, but insulin values determined in oxalate-plasma are lower than those obtained with lithium heparin-plasma or serum (L6). Specimens collected in EDTA demonstrate lower carbon dioxide combining power than those observed with serum or heparin or potassium oxalate plasma (Zl). 

Potassium formate is used to prepare potassium oxalate simply by heating at 360°C. 

Potassium oxalate, along with calcium oxalate, is found in leaves and roots of certain plants. It is used for cleaning and bleaching straw and for removing stains. It also is used in photography, in clinical tests, as a secondary pH standard, and in wet chemical analysis. The analytical apphcation involves standardization of many oxidizing agents in titrimetric analysis. 

Potassium oxalate can be preparaed by heating potassium formate at 360°C ... 

Phosphatidylinositols are separated on a gypsum-free silica plate, saturated with a 1% potassium oxalate solution in water, and activated as described above. The recommended solvent is Soln. 2. A second run with the same solvent after an intermediate drying increases the separation performance. 

In addition to the partially oxidized tetracyanoplatinates, bis(oxalato)platinate-(II) can be nonstoichiometrically oxidized by chemical oxidants13 to form highly lustrous needlelike crystals containing platinum in the 2.36 oxidation state. These complexes have not been characterized to the extent of the tetracyano-platinate complexes however, the oxalato complexes are reported to be highly conducting.13 The starting material is bis(oxalato)platinate(II), which can be prepared in 30% yields from hexachloroplatinate(lV) and potassium oxalate.9... 

---