Mercury tellurate

Ferric salts are reduced to the ferrous condition and chromates are reduced to chromic salts. Salts of gold, silver, copper, antimony, bismuth and mercury are reduced to the free metals, which are frequently obtained as colloidal solutions if the original solutions are weak with the exception of the first-named there is a tendency for the liberated metal to be accompanied by sulphide, especially if excess of hydrosulphite is used.7 Chloroplatinic acid is reduced to red chloroplatinous acid solution. Tellurous and telluric acids, selenious acid and arsenic compounds, are reduced to the free elements.8... 

Possibly owing to its oxidising power, telluric add in warm aqueous solution is more active towards metals than might be expected from its feeble acidity, even lead, tin, silver and mercury being attacked.9... 

Jung, W., Knitzschke, G. and Gerlach, R. (1974) Zu den Schadstoffkomponenten Arsen, Antimon, Wismut, Tellur und Quecksilber im Kupferschiefer des Sudostharzvorlands (The toxic compounds in the Kupferschiefer of the southeastern Harz forelands arsenic, antimony, bismuth, tellurium, and mercury). Zeitschrift ftir Angewandte Geologie, 20(5), 205-11. 

Dimethyl mercury reacted with hydroxy tellurium pentafluoride at 0° with evolution of methane and quantitative formation of white, crystalline methyl mercury pentafluoro-(oxo)tellurate(Vl), a sublimable, light-sensitive compound2. 

An excess of hydroxy tellurium pentafluoride and temperatures up to 140° did not produce mercury bis[pentafluoro(oxo)tellurate(VI)]2. 

The noble-gas compounds xenon bis(pentafluoro-orthoselenate) and xenon bis(pentafluoro-orthotellurate) are the most thermally stable of the Xe(OR)2 compounds so far known. The first decomposition products of these compounds have now been shown291 to be SeOFs and TeOF5, as shown by e.s.r spectra at low temperatures. U.v. irradiation of the xenon bis(fluoro-orthochalcogenates) at room temperature results in the quantitative formation of the peroxides F5MOOMF5 (M = Se or Te). Attempts to prepare the compound FOTeFs were unsuccesful, but the compound ClOTeFs was prepared by the reaction of mercury bis(pentafluoro-ortho-tellurate) with C1F. 

Colorless gas. Repulsive odor, mp —37.6°. Sublimes at — 38,9°, Critical temperature 83°. d (solid —191°) 4.006 d (liq —10°) 2.499. Not as inert chemically as SeF( and SF, because the covalence maximum of tellurium is higher than 6. Slowly absorbed by water with hydrolysis to telluric acid, H6TeOt more quickly hydrolyzed by aq KOH. Does not attack glass when pure. Corrodes mercury. 

CHEMICAL PROPERTIES stable under ordinary conditions of use and storage hydrolyzes slowly in water to telluric acid (H606Te) more quickly hydrolyzed by aqueous potassium hydroxide when pure, does not attack glass corrosive to mercury not as chemically inert as sulfur hexafluoride (SF(,) and selenium hexafluoride (SeFs) because the maximum covalence of tellurium is greater than six FP (NA) LFLZUFL(NA) AT(NA) HC(NA) HF(-1318.0 kJ/mol gas at 25 C) Tc (83 C, 181.4 ). 

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