Potassium chloroplatinates

Color. Many water samples have a yellow to brownish-yeUow color which is caused by natural substances, eg, leaves, bark, humus, and peat material. Turbidity in a sample can make the measurement of color uncertain and is usually removed by centrifiigation prior to analysis. The color is usually measured by comparison of the sample with known concentrations of colored solutions. A platinum—cobalt solution is used as the standard, and the unit of color is that produced by 1 mg/L platinum as chloroplatinate ion. The standard is prepared from potassium chloroplatinate (K PtCl ) and cobalt chloride (C0CI26H2O). The sample may also be compared to suitably caUbrated special glass color disks. 

Kalium-oxyd, n. potassium oxide, -oxydhydrat, n. potassium hydroxide, -permangaoat, n. potassium permanganate, -platinchlorid, n. potassium chloroplatinate, potassium chlo-roplatinate(IV). -platmchloriir, n. potassium chloroplatinite, potassium chloroplatinate (II). -platmcyaniir, n. potassium cyano-platinite, potassium cyanoplatinate(II). 

Platinum monoxide may be obtained as a black precipitate when an alkali hydroxide is added to an aqueous solution of potassium tetrachloroplati-nate(II) (potassium chloroplatinate), K2PtCl4. 

Acid (sp gr 1.19) and Potassium Chloroplatinate, KgPtCIg, shall conform to ASTM Method E200... 

Color. Standards Stock standard. Dissolve 1.245g of potassium chloroplatinate (K2PtCl6) and l.OOOg of cobaltous chloride (C0CI26H2O) in water. Add 100ml of coned HQ, and dilute the soln to 1000.0ml with water. (This soln has a color of 500 on the APHA and ASTM platinum-cobalt scales)... 

Platinic Arsenate has been obtained 4 as red crystals by treating a solution of the hydroxyarsenide, Pt(OH)As, in aqua regia with potassium chloroplatinate. It was described by Thomson5 as a pale brown precipitate obtained by double decomposition of sodium arsenate and platinic nitrate. 

ChloroplaUnate. Potassium chloroplatinate, [CAS 16921-30-5], KiPtClg, yellow solid, insoluble., formed by reaction of soluble potassium salt solution and chloroplatinic acid. Used in the quantitative determination of potassium. 

The test serves to identify potassium in presence of sodium. The metal is detected and estimated quantitatively by precipitation with chloro-platinic acid as potassium chloroplatinate, KaPtClg, or by conversion into perchlorate. The insolubility of these salts in alcohol facilitates the separation of potassium from sodium.1 Acetone has the advantage of dissolving both chloroplatinic acid and sodium chloroplatinate, but not the potassium salt.8 The metal is also estimated as sulphate, chloride, primary tartrate,3 and cobaltinitrite.4... 

It was somewhat puzzling that while olefin compounds of platinum(II) were well established, acetylene complexes were virtually unknown. Acetylene gives red intractable materials on reaction with potassium chloroplatinate(II) in aqueous solution, presumably acetylides and dimethylacetylene does not react, in marked contrast to ethylene, which forms [PtCl3(C2H4)] . However, Gel man, Bukhovets, and Meilakh (44)... 

Hofmann and von Narbutt (5J) in 1908 described some compounds formed by the reaction of aqueous potassium chloroplatinate(II) in aqueous alcohols (ROH) with dicyclopentadiene. They formulated them as (XI) in which ROPtCl had added across one of the double bonds of the diene. This formulation could not be correct because it... 

PLATINIC POTASSIUM CHLORIDE POTASSIUM CHLOROPLATINATE POTASSIUM HEXACHLORO-PLATINATE(IV)... 

When potassium nitrate and potassium chloroplatinate were used in the fusion, no bronze was formed.The only species detected by X-ray diffraction were platinum metal and a Pt02. A report that the use of ammonium chloroplatinate in the fusion gave a better catalyst than when chloroplatininic acid was used might also have been the result of an inhibition of bronze formation by the ammonium salt. ... 

K2PtCl4 Potassium chloroplatinite Potassium tetrachloroplatoate K2PtCle Potassium chloroplatinate Potassium hexachloroplateate... 

Fig. xo.o6. Clinographic projection of the unit cell of the cubic structure of potassium chloroplatinate, K2PtCl6. 

Potassium HexachloroplatinatedV). Platinic potassium chloride potassium platinic chloride potassium chloroplatinate. CI4K2Pt mol wt 486.03. a 43.76%, K 16.08%, Pt 40.16%. KJPtClJ. 

Potassium TetrachloroplatfnateUI). Platt nous potassium chloride potassium platinochloride potassium chloroplatinate. Cl4K2Pt mol wt 415,26. Cl 34.15%, K. 18.83%, Pt 47.01%. Kj[PtOJ. 

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