Potassium general properties

C. It occurs in natural gas. May prepared by reduction of ethene or ethyne by hydrogen under pressure in the presence of a nickel catalyst, or by the electrolysis of a solution of potassium elhanoate. It has the general properties of the paraffins. Used in low-temperature refrigeration plant. 

Triamterene is also a diuretic with distal tubule action and potassium retaining properties. It is not generally used alone as an antihypertensive agent. 

The esters can be used as acids, but are also often used as sodium or potassium salts. With such a wide potential for structure and properties, it is difficult to draw general properties for the whole class. They are more stable to hydrolysis than are sulphates and can be used across a wide range of pH and temperatures, but other properties are highly dependent on the degree of esterification and the alcohol used. 

Cesium Brom-palladate, Cs,PdBre. and Rubidium Brom-palladate, Rb2PdBre, have also been prepared. They resemble the potassium salt in appearance and general properties.1... 

Experiment 153. — Dissolve i gm. of copper sulphate in 15 cc. of water, and 5 gm. of Rochelle salt (sodium potassium tartrate) in 10 cc. of water mix these solutions, warm, and filter. Add to this filtrate about 5 cc. of a dilute solution of grape sugar (or of cane sugai which has been boiled at least five minutes with dilute sulphuric acid), and enough sodium hydroxide solution to dissolve any precipitate. The solution must be strongly alkaline. Boil until a decided change is produced. The product is cuprous oxide. Describe it. Show by a comparative table the general properties of the two oxides of copper. 

The spectra and the general properties of the lithium and magnesium allyl complexes indicate that they are essentially covalent compounds. However, in contrast, the sodium and potassium allyl complexes appear to be essentially salts. 

Other Borohydrides. Potassium borohydride was formerly used in color reversal development of photographic film and was preferred over sodium borohydride because of its much lower hygroscopicity. Because other borohydrides are made from sodium borohydride, they are correspondingly more expensive. Generally their reducing properties are not sufficiently different to warrant the added cost. Zinc borohydride [17611-70-0] Zn(BH 2> however, has found many appHcations in stereoselective reductions. It is less basic than NaBH, but is not commercially available owing to poor thermal stabihty. It is usually prepared on site in an ether solvent. Zinc borohydride was initially appHed to stereoselective ketone reductions, especially in prostaglandin syntheses (36), and later to aldehydes, acid haHdes, and esters (37). 

Orthophosphate salts are generally prepared by the partial or total neutralization of orthophosphoric acid. Phase equiUbrium diagrams are particularly usehil in identifying conditions for the preparation of particular phosphate salts. The solution properties of orthophosphate salts of monovalent cations are distincdy different from those of the polyvalent cations, the latter exhibiting incongment solubiUty in most cases. The commercial phosphates include alkah metal, alkaline-earth, heavy metal, mixed metal, and ammonium salts of phosphoric acid. Sodium phosphates are the most important, followed by calcium, ammonium, and potassium salts. 

Rubidium [7440-17-7] Rb, is an alkali metal, ie, ia Group 1 (lA) of the Periodic Table. Its chemical and physical properties generally He between those of potassium (qv) and cesium (see Cesiumand cesium compounds Potassium compounds). Rubidium is the sixteenth most prevalent element ia the earth s cmst (1). Despite its abundance, it is usually widely dispersed and not found as a principal constituent ia any mineral. Rather it is usually associated with cesium. Most mbidium is obtained from lepidoHte [1317-64-2] an ore containing 2—4% mbidium oxide [18088-11-4]. LepidoHte is found ia Zimbabwe and at Bernic Lake, Canada. 

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