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The reaction is conveniently conducted with an acetic acid solution of mercury(II) acetate. With gentle heating of the slurry, the black polymorph converts to the red form. [6] β-HgS is unreactive to all but concentrated acids. [4] Mercury is produced from the cinnabar ore by roasting in air and condensing the vapour. [4] HgS → Hg + S
For example, mercury sulfide forms when mercuric salts in aqueous solution are treated with thiourea: Hg 2+ + SC(NH 2) 2 + H 2 O → HgS + OC(NH 2) 2 + 2 H + These sulfiding reactions, which have been applied to the synthesis of many metal sulfides, require water and typically some heating. [16] [17]
Mercury(II) sulfide, HgS, adopts the cinnabar structure described, and one additional structure, i.e. it is dimorphous. [16] Cinnabar is the more stable form, and is a structure akin to that of HgO : each Hg center has two short Hg−S bonds (each 2.36 Å ), and four longer Hg···S contacts (with 3.10, 3.10, 3.30 and 3.30 Å separations).
Mercury(I) sulfide or mercurous sulfide is a hypothetical chemical compound of mercury and sulfur, with elemental formula Hg 2 S.Its existence has been disputed; it may be stable below 0 °C or in suitable environments, but is unstable at room temperature, decomposing into metallic mercury and mercury(II) sulfide (mercuric sulfide, cinnabar).
When mercury(II) sulfide (HgS) reacts with oxygen (O 2), it will form gray mercury vapor and sulfur dioxide. If the reaction is performed inside a container, a gray film of mercury coating on its inner surface can be observed. HgS(s) + O 2 (g) → Hg(l) + SO 2 (g) [1]
Mercury(II) sulfate, commonly called mercuric sulfate, is the chemical compound Hg S O 4. It is an odorless salt that forms white granules or crystalline powder. It is an odorless salt that forms white granules or crystalline powder.
Similarly, diphenylmercury (melting point 121–123 °C) can be prepared by reaction of mercury chloride and phenylmagnesium bromide. A related preparation entails formation of phenylsodium in the presence of mercury(II) salts. [14] Hg(II) can be alkylated by treatment with diazonium salts in the presence of copper metal. In this way 2 ...
The standard Gibbs free energy of formation (G f °) of a compound is the change of Gibbs free energy that accompanies the formation of 1 mole of a substance in its standard state from its constituent elements in their standard states (the most stable form of the element at 1 bar of pressure and the specified temperature, usually 298.15 K or 25 °C).