Mercury precipitate

In this respect the final Cr(III) product is the monomeric species and not the green dimer. Furthermore, if Hg(II) is not in excess then reaction (9.3) cannot occur, and mercury precipitates. The reaction is appreciably catalysed by chloride ions. At 10 °C, the specific rate coefficients for the reaction of Cr with HgCl, HgOH , and Hg " are 1.5, 2.3x10, and 1.75x10 l.mole sec , respectively. The species HgCl2 is much less reactive than HgCl . ... 

In 1775, Lavoisier published his paper on the composition of the air. In this historically interesting memoir, Lavoisier refers first to the action of heat upon a mixture of iron calx (oxide) and charcoal in giving fixed air, and to the similar action of mercury precipitate and charcoal. He then describes an experiment, in which he subjected the mercury precipitate to strong heat by itself and collected the expelled gas over water. This gas on examination gave properties familiar to us as those of oxygen. 

Potassium cyanide (POISON) produces mercury(II) cyanide solution and mercury precipitate ... 

The interference of copper, nickel, cobalt, iron, chromium, and magnesium is prevented by adding sodium potassium tartrate to the test solution only silver (removed as silver iodide by the addition of a little KI solution) and mercury then interfere. Mercury is best removed by adding a little sodium potassium tartrate, a few crystals of hydroxylamine hydrochloride, followed by sodium hydroxide solution until alkaline the mercury is precipitated as metal. Tin(II) chloride is not suitable for this reduction since most of the cadmium is adsorbed on the mercury precipitate. 

Lemery followed up his general reflection on solution chemistry with a much more detailed study on the precipitates of mercury. This was a subject in which Homberg had maintained a keen interest, although Lemery listed the abnormal color pattern of mercury precipitates as the main reason for his interest. When one precipitated a metal from its dissolution in various acids with an absorbent salt, the precipitate acquired a variety of colors depending on the circumstances. Silver, lead, and tin. 

AURUM VITAE — Gold of Life, is Precipitated Gold, or Mercury precipitated with Gold, and reverberated to a deep red. A precipitate made with gold, and brought by means of fire to an intense redness. 

PRECIPITATE PHILOSOPHICAL — Mercury Precipitated by the Internal Fire of Gold or Gold essentialized. 

SYNS AMINOMERCURIC CHLORIDE AMMONI-ATED MERCURY MERCURIC AMMONIUM CHLORIDE, solid MERCURIC CHLORIDE, AMMONIATED MERCURY AMINE CHLORIDE MERCURY AMMONIATED D WHITE MERCURY PRECIPITATED WHITE PRECIPITATE... 

Blood and urine Total mercury precipitation-extraction with 50% volume/volume hydrochloric acid containing EDTA and cysteine centrifugation filtration through screening column. Methyl mercury extraction of the methyl mercury into benzene or toluene back extract into aqueous cysteine solution ICP-MS 0.2 g/L 91.6- 110.2 Kalamegham and Ash 1992... 

WHITE MERCURY PRECIPITATE (10124-48-8) Reacts violently with halogens barium, chlorine, fluorine, and metal salts of amines. Contact with acids or acid fumes causes decomposition, producing hydrogen chloride fumes. Incompatible with organic anhydrides, acrylates, alcohols, aldehydes, alkylene oxides, substituted allyls, cresols, caprolactam solution, epichlorohydrin, ethylene dichloride, glycols, isocyanates, ketones, maleic anhydride, nitrates, nitromethane, phenols, vinyl acetate. May corrode aluminum, copper, zinc, and some stainless steel in the presence of moisture. 

Aminomercuric chloride Aminomercury chloride Ammoniated mercuric chloride Ammoniated mercury EINECS 233-335-8 HSDB 1175 Hydrargyrum ammonialum Hydrargyrum praecipitatum album Hydrargyrum precipitatum album Lemer/s white precipitate Mercuric amidochloride Mercuric ammonium chloride Mercuric chloride, ammoniated Mercury amide chloride (Hg(NH2)CI) Mercury amide chloride Mercury amine chloride Mercury, ammoniated Mercury ammonium chloride Mercury, ammonobasic (HgNHjCI) Mercury(ll) chloride ammonobasic Quecksilber(ll)-amid-chlorid UN1630 White mercuric precipitate White mercury precipitated White precipitate. Mercury ammonium chloride, used for the preparation of cinnabar and in medicine as a topical anti-intective. Powder d = 5.38 insoluble in H2O, EtOH, soluble in mineral xids. 

Mawson (1935) appears to have been the first to make a proper study of this problem he showed that the power of animal tissues to protect ascorbic acid from oxidation was also possessed by dialyzed tissue extracts, and that even boiling or mercurial precipitation did not wholly destroy this property. He concluded that glutathione was probably one of the factors involved in maintaining ascorbic acid in the reduced state in animal tissues. 

Synonyms Aminomercuric chloride Ammoniated mercury Mercuric ammonium chloride Mercuric ammonium chloride, solid Mercuric chloride, ammoniated Mercury-amide-chloride Mercury (II) amidochloride Mercury amine chloride Mercury ammoniated White mercury precipitated White precipitate Empirical CIH2HgN Properties M.w. 252.07 Toxicology Toxic Uses Oral homeopathic drugs Manuf./Disthb. GFS... 

White mercury precipitated. See Mercury ammonium chloride... 

Reuse of existing facilities requires removal of contained mercury but not dismantling and detoxification of the debris. Demercurization of brine treatment systems, for example, is straightforward and sometimes quite easy to apply. TTiis is particularly so when the brine recycle system has been operated with a low level of dissolved chlorine to prevent mercury precipitation. Lott [19] reports that such a system was drained, washed with dilute acid to remove deposits and then with dilute hypochlorite solution to solubilize mercury, and finally flushed with hot water. The residual mercury concentration was well within the specification for the new membrane cells. 

For the preparation of red mercury precipitate, which did not actually involve precipitation, see Crosland [1962] p. 89. 

When calces are reduced by carbon fixed air is evolved. The reduction of mercury precipitate without addition of carbon or phlogiston would seem likely to throw light on this question. He found that the air disengaged was not fixed air, did not precipitate lime water, was more proper to support the combustion of candles, and ... 

The coenzyme is isolated from an alcoholic extract of toluene-treated baker s yeast. The procedure involves a selective mercury precipitation, charcoal chromatography, and the removal of ninhydrin-positive material by a cation exchange resin. The barium salt of the coenzyme is water insoluble. 

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