Mercuric hydroxide

Methyl mercuric Azide (Mercuric methylazide). CH3HgN3 cry sts from alc mp 130.5° decompn explosively ca 200°. Was prepd by Perret Perrot (Ref 3) by treating methyl mercuric hydroxide, CH3HgOH (Ref 1) with hydrazoic acid... 

Methylmercuric Chromate. CH3HgCr04 cry sts decomps explosively ca 255—60°. Was prepd by the reaction of chromic acid with methyl-mercuric hydroxide (Ref 3)... 

Mercuric Orthoarsenite, Hg3(As03)2, is precipitated in an impure state when an aqueous solution of mercuric chloride is treated with a solution of arsenious oxide in 50 per cent, alcohol. The salt is unstable and loses arsenious oxide at 150° C. It is slowly reduced to mercury and mercurous hydroxide by water, in which it is sparingly soluble, and by aqueous alkalis and ammonia. It dissolves in acids, but with sulphuric acid a basic sulphate is formed. 

Its Mercuric Hydroxide denv, H0 Hg NH-C00.C2Ha, prepd by treating an ale of soln of equimolar quantities of urethylan St mercuric acetate, is obtd as yei scales which dec on heating(Ref 2)... 

P. Longhi, T. Mussini, R. Orsenigo and S. Rondinini, Redetermination of the standard potential of the mercuric oxide electrode at temperatures between 283 and 363 K and the solubility product constant of mercuric hydroxide , Journal of Applied Electrochemistry, 17,1987, pp 505-514. 

In every case a precipitate is formed with a small amount of the reagent as follows (a) light blue Cu(OH)2, (b) brown Ag20, (c) white Zn(OH)2, (d) white Cd(OH)2, (e) black Hg20, (f) yellow HgO. Those precipitates whose formulas are given as hydroxides are in fact likely to come down as rather indefinite basic salts, that is, as mixtures of the hydroxides and the salt, but for the sake of simplicity in discussion it is allowable to regard them as hydroxides. Silver, mercurous, and mercuric hydroxides do not exist in the solid state they lose water and form the oxides. 

Isobutyl-1 -methylxanthine Methyl methacrylate Mono-A-methylacetoacetamide Methyl magnesium carbonate A-Monomethylformamide Methyl mercuric hydroxide... 

Potassium i)er-manganate. Methyl mercuric hydroxide ( ) (not isolated). Seidel, J. prakt. Ghem.f 1884, [2], 29,135. 

Potassium permanganate. Boil mixture in aqueous solution. Heat. Ethyl mercuric hydroxide. Mercury, combustible gas. Seidel,praht, Chem., 1884, (2), 29, 134. Buckton, loc. oil. 

By the addition of hydrochloric acid to the solution of methyl mercuric hydroxide described above. 

Iodide,—Combination takes place between ethyl iodide and metallic mercury when exposed to diffused daylight, with formation of ethyl mercuric iodide.This may also be obtained by the addition of an alcoholic solution of iodine to ethyl mercuric hydroxide, or from mercury diethyl by boiling for one or two days with allyl iodide. iVnother preparation from mercury diethyl is to heat for several days at 120° C. with iodoform, when the iodide, ethyl iodide, ethylene, and acetylene are formed. ... 

The 2AM-trinitrobenzoate is formed by treating the substituted benzoic acid in alcohol with a similar solution of ethyl mercuric hydroxide. It forms white plates, 164° C. When heated at 165° C. it yields... 

Isopropyl Series. —iso-propyl mercuric hydroxide is formed by treating the halides with moist silver oxide, and has only been obtained in solution. It reacts with acids, giving rise to the following comj ounds chloride needles, M.jDt. 97° C. bromide needles, M.pt. 98° C. iodide plates, M.pt. 125° C. acetate M.pt. 95° C. cyanide, M.pt. 85° C. sulphide, M.jDt. 60° C. 

The acetoxymercuri compounds formed above are conv erted to chloromerciiri salts by the addition of sodium chloride, and to the hydroxides by means of sodium hydroxide. When the amino group is not substituted, water may be eliminated between this group and the bydroxymercuri residue, yielding an anhydride, e,g, p-aminophenyl-mercuric hydroxide is considered to exist as... 

To the alcoholic solutions of the alkyl or aryl mercuric hydroxides, obtaineti from the corresponding chlorides by treatment with sodium... 

Carbon disulpliide, reaction with alkyl or aryl mercuric hydroxides, 190. Can acrol, mercuration of, 13T, 152. 

In the atmosphere, particulate bound mercury constitutes only 2% of total mercury in the air and has normally been found to be less than 0.1 ngm in regions unaffected by local sources. Some other mercury compounds, which may exist in the atmosphere, are mercuric chloride, mercuric bromide, mercuric hydroxide, mercuric sulfide, and mercuric cyanide. The rest is elemental mercury in the gaseous phase. In remote areas over the Atlantic and Pacific oceans, mercury bound to particulate matter concentrations are generally at or below the picogram per cubic meter level. 

Thus, when OH" is added to a solution of Hg +, a dark precipitate consisting of Hg and HgO is formed evidently mercurous hydroxide, if it could be isolated, would be a stronger base than HgO. Similarly, addition of sulfide ions to a solution of Hg + gives a mixture of Hg and the extremely insoluble HgS. Mercurous cyanide does not exist because Hg(CN)2 is so slightly dissociated though soluble. The reactions in these cited cases are... 

Among the best known of the few mercurous compounds are the halides. The fluoride is unstable toward water, being hydrolyzed to hydrofluoric acid and unisolable mercurous hydroxide (which disproportionates as above). The other halides are highly insoluble, which thus precludes the possibilities of... 

Among the mercuric salts that are totally ionic and hence highly dissociated in aqueous solution are the nitrate, sulfate, and perchlorate. Because of the great weakness of mercuric hydroxide, aqueous solutions of these salts tend to hydrolyze extensively and must be acidified to be stable. 

Synonyms Hydroxymethylmercury Methylhydroxymercury Methyl mercuric hydroxide... 

Be sure to use the appropriate laboratory technique when handhng radioactive and toxic materials. Consult a laboratory safety manual if you are in doubt regarding what proper practices are. Methyl mercuric hydroxide is quite toxic and should be handled with extreme care in a fume hood. This toxicity is balanced by its... 

As an application of this principle, we can explain the fact that mercuric hydroxide, Hg(OH)2, dissolves readily in an acidic aqueous solution, whereas mercuric sulfide, HgS, does not. Mercuric sulfide can be considered to be formed by a combination of Hg and a soft acid and a soft base. However, mercuric hydroxide is formed by a combination of Hg , a soft acid, and OH, a hard base. Therefore, HgS (both soft) is more stable than Hg(OH)2 (one soft and one hard). 

A permeable barrier of specially selected material prevents migration of any solid particles in the cell, thereby contributing effectively to long shelf and service life and also inhibiting the diffusion and migration of soluble mercuric hydroxide species from the cathode, which causes self-discharge of the zinc anode. 

Garrett, A.B. and Hirschler, A.E. (1938) The solubilities of red and yellow mercuric oxides in water, in alkali and in alkaline salt solutions. The acid and basic dissociation constants of mercuric hydroxide. / Am. Chem. Soc., 60, 299—306. 

KolthofF, I.M., (1917) The dissociation constants of mercuric hydroxide. Chem. Weekblad., 14, 1016-1022. 

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