Potassium solubility

Potassium Arsenites.—At 25 C. the ternary- system K20-As203— HaO indicates the existence of two arsenites of potassium, soluble in water without decomposition 9 these are potassium tetrarsenite, K2As407, and potassium metatetrarsenite, K8As409.12H20. 

SILICATES (Soluble). The most common and commercially used soluble silicates are those of sodium and potassium. Soluble silicates are systems containing varying proportions of an alkali metal or quaternary ammonium ion and silica. The soluble silicates can be produced over a wide range of stoichiometric and nonstoicluometric composition and are distinguished by the ratio of silica to alkali. This ratio is generally expressed as the weight percent ratio of silica to alkali-metal oxide (SiOj/MjO). Particularly with lithium and quaternary ammonium silicates, the molar ratio is used. 

Chabot N. E. and Drake M. J. (1999) Potassium solubility in metal the effects of composition at 15 kbar and 1,900 degrees C on partitioning between iron alloys and silicate melts. Earth Planet. Sci. Lett. 172, 323—335. 

Potassium tartrate 4196 K2C4H40 Neutral tartrate neutral tartrate of potassium soluble tartrate tartrate of potassa vegetable salt. 

To address the recoverability of the alkali carbonate catalyst from the ash, both ambient and warm water washes were used. In the ambient temperature wash, 1 gram of ash was stirred 1 hr in 100 ml H20. Between 80-100% (87% average for 24 samples) of the initial potassium used in the gasification run could be dissolved in the aqueous solution. The range of potassium solubility reflects some of the difficulties previously referred to. No attempt was made to recrystallize potassium compounds from the ambient temperature washes. 

As it has been shown by Roy [80] the alkahs content in the pore solution of cement paste was significantly lower at 50% slag addition (Fig. 6.35). It should be tmderlined that this phenomenon is observed irrespectively of the alkali content in mineral additions, which can be higher than in cement. Similarly, the sodium and potassirrm content decrease in pore solution occirrs in case of fly ash cement paste [115]. The effect of fly ash is, however, not clear, because in some cases Diamond [129], as well as Glasser and Marr [130], observed the increase of these ions concentration in the liquid phase of cement paste. However, these authors are of the opinion that silica firme arrd, after longer period of time, fly ash, reduce the sodium and potassium soluble corttpotmd content [129, 130]. 

The tin mordenites were analysed for sodium, potassium, soluble tin, and tin(IV) oxide. With certain assumptions (Si/Al ratio not changing during the preparations, all tin in the zeolite associated with two positive charges, but not necessarily in oxidation state (II)) the formula for the R = 0.2 preparation was calculated to H2.7Nao.5Ko.o5Sn2.4Al8Si4o096... 

Inorganic chemicals important to the environment include oxygen and carbon dioxide key nutrients such as phosphorus (mostly as phosphate) and nitrogen (in the form of ammonia or nitrate) common metals which are essential to life, such as iron, calcium, magnesium, and potassium soluble salts, which are abundant in the ocean and occur in lesser concentrations in all natural waters numerous aluminosilicate minerals as well as... 

CH OfiSj, H2C(S03H)2- a colourless, crystalline solid which readily absorbs water vapour decomposes on distillation. The potassium salt is prepared by heating methylene chloride with an aqueous solution of potassium sulphite under pressure at 150-I60" C. The free acid is obtained by decomposing the sparingly soluble barium salt with sulphuric acid. The aryl esters are very stable, but the alkyl esters decompose on heating to give ethers. Resembles malonic acid in some of its reactions. 

KCl —NaCl —MgS04) and in many brines. Separated by fractional crystallization, soluble water and lower alcohols. Used in fertilizer production and to produce other potassium salts. 

Racemic acid, ( )-tartaric acid, is a compound of the two active forms. M.p. 273 C (with IHjO), m.p. 205°C (anhydrous). Less soluble in water than (-t-)-tartaric acid. Formed, together with mesotartaric acid, by boiling (4-)-tartaric acid with 30% NaOH solution, or by oxidation of fumaric acid. Potassium hydrogen racemate is very insoluble. 

Mesotartaric acid crystallizes in plates (IHjO), m.p. 140 C (anhydrous). Very soluble in water. Obtained from the mother-liquors in the preparation of racemic acid or by oxidation of maleic acid. Potassium hydrogen mesotartrale is soluble in water. 

The hydroxides M (OH)2 are generally less soluble and are of lower base strength. The Group I hydroxides are almost unique in possessing good solubility—most metal hydroxides are insoluble or sparingly soluble hence sodium hydroxide and, to a lesser extent potassium hydroxide, are widely used as sources of the hydroxide ion OH" both in the laboratory and on a large scale. 

Why is potassium aluminium sulphate not soluble in benzene A compound M has the composition C = 50.0% H=12.5%o A1 = 37.5%. 0.360 g of M reacts with an excess of water to evolve 0.336 1 of gas N and leave a white gelatinous precipitate R. R dissolves in aqueous sodium hydroxide and in hydrochloric acid. 20 cm of N require 40 cm of oxygen for complete combustion, carbon dioxide and water being the only products. Identify compounds N and R, suggest a structural formula for M, and write an equation for the reaction of M with water. (All gas volumes were measured at s.t.p.)... 

Addition of silver nitrate to a solution of a chloride in dilute nitric acid gives a white precipitate of silver chloride, AgCl, soluble in ammonia solution. This test may be used for gravimetric or volumetric estimation of chloride the silver chloride can be filtered off, dried and weighed, or the chloride titrated with standard silver nitrate using potassium chromate(VI) or fluorescein as indicator. 

Sodium sulphate crystallises out in hydrated form (common ion effect) and is filtered off on concentration, sodium dichromate is obtained. For analytical purposes, the potassium salt. K2Cr20-. is preferred potassium chloride is added and the less soluble potassium dichromate obtained. 

Silver chloride is readily soluble in ammonia, the bromide less readily and the iodide only slightly, forming the complex cation [Ag(NH3)2]. These halides also dissolve in potassium cyanide, forming the linear complex anion [AglCN) ] and in sodium thiosulphate forming another complex anion, [Ag(S203)2] ... 

In neutral solution, the indicator is potassium chromate(VI). In acid solution the CrOj" ion changes to CrjO (p. 378). and since silver dichromatefVI) is soluble, chromate(VI) is not a suitable indicator other methods can be used under these conditions. (In alkaline solution, silverfl) oxide precipitates, so silver(I) nitrate cannot be used under these conditions.)... 

Sodium dichromate is used instead of the potassium salt because it is far more soluble in water, and is not precipitated from its aqueous solution by addition of the ethanol. It is also cheaper than the potassium salt, but has the disadvantage of being deliquescent. 

Pure ethyl hydrogen sulphate is difficult to prepare, as it is an oily liquid, very soluble in water, and easily hydrolysed. It is therefore usually isolated as the potassium salt, since potassium ethyl sulphate crystallises well from water, and is not readily hydrolysed in neutral or weakly alkaline solution. 

---