Mercuric precipitate , white

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. 

Formic acid solution reacts as follows 11) with hydroxides, oxides, carbonates, to form formates, e g., sodium formate, calcium formate, and with alcohols to form eslers (2) with silver of ammonio-silver nitrate to form metallic silver (3) with ferric formate solution, upon heating, to form red precipitalc of basic ferric formate (4) with mercuric chloride solution to form mercurous chloride, white precipitate and (SI with permanganate lin the presence of dilute H-SOj) to form CO and manganous salt solution. Formic acid causes painful wounds when it ennies in contact with the skin. At IhO C. formic acid yields CO plus H . When sodium formate is heated in vacuum at 300°C. H- and sodium oxalate are formed. With concentrated ll.SOj heated, sodium formate, or other formate, or formic aeid. yields carbon monoxide gas plus water. Sodium formate is made by healing NaOH and carbon monoxide under pressure at 2I0 C. 

E. P. Alvarez 2 found that the pemitrates react with soln. of lead acetate (white precipitate), silver nitrate (white precipitate), mercurous nitrate (white precipitate with rapid decomposition), mercuric chloride (red precipitate), copper sulphate (blue precipitate), zinc and cadmium sulphates (white precipitate), bismuth nitrate (white precipitate), gold chloride (slight effervescence and escape of oxygen), manganous chloride (pink precipitate), nickelous chloride or sulphate (greenish-white precipitate), cobaltous nitrate and chloride (pink precipitate), ferrous sulphate (green or bluish-green precipitate), ferric chloride (red ferric hydroxide), and alkaline earth chlorides (white precipitates). The precipitates are all per-salts of the bases in question. 

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

The precipitation of mercurous chloride and its change in color from wnite to black on addition of ammonium hydroxide are used as the test for mercurous mercury in qualitative analysis. The effect of ammonium hydroxide is due to the formation of finely divided mercury (black) and mercuric aminochloride (white) by an auto-oxidation-reduction reaction ... 

Mercuric Chloride, Ammoniated. Mercury amide chloride arninomercuric chloride mercury ammonium chloride ammoniated mercury white precipitate white mercuric... 

Mercury. Mercuric. Stannous chloride precipitates white mercurous chloride or gray mercury. 

Mercurous. Hydrochloric acid precipitates white mercurous chloride, which is converted into a black compound by ammonium hydroxide. 

White mercuric precipitate (infusible) ammoniated mercuric chloride. 

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... 

REACTIONS AND IDENTIFICATION 325 drop. JNote that the white precipitate of silver salts turns black (showing the presence of silver cyanide). Now add an excess of mercurous nitrate the black precipitate redissolves, but the silver halide remains undissolved. 

Mercuric chloride test. Add mercuric chloride solution to formic acid or a solution of formate and w arm. A white precipitate of mercurous chloride, insoluble in dil. HCl, is produced. Sometimes the reduction proceeds as far as metallic mercury, which appears as a grey precipitate. 

Mercurous Bromide. Mercurous hi.omide[15385-58-7] Hg2Br2, is a white tetragonal crystalline powder, very similar to the chloride, and prepared in much the same way, ie, by the direct oxidation of mercury by bromine or by precipitation from mercurous nitrate by sodium bromide. It is sensitive to light, less stable than the chloride, and is not of appreciable commercial importance. 

Mercuric Bromide. Mercuric hi.omide[7789-94-7] HgBr2 is a white crystalline powder, considerably less stable than the chloride, and also much less soluble in water (0.6% at 25°C). Therefore, it is prepared easily by precipitation, using mercuric nitrate and sodium bromide solution. Drying of the washed compound is carried out below 75°C. Mercuric bromide has a few medicinal uses. 

In the field, cassiterite ore is usually recognized by its high density (7.04 g/cm ), low solubiUty in acid and alkaline solutions, and extreme hardness. Tin in solution is detected by the white precipitate formed with mercuric chloride. Stannous tin in solution gives a red precipitate with toluene-3,4-dithiol. 

A solution of potassium mercuric iodide, which foims white or yellow ish-wdiite precipitates. 

To a refluxing solu tion of 100 g of allyl urea and 600 ml of absolute methanol there was added with stirring a suspension of 319 g of mercuric acetate and 600 ml of absolute methanol and 60 ml of glacial acetate acid complete solution resulted. After 6 hours of refluxing, the solution was cooled and clarified by filtration. To this solution there were added 50 g of sodium chloride and 240 ml of water. After a short time a heavy white precipitate settled out. This precipitate, which wes3-chloromercuri-2-methoxy-propylurea, was filtered, washed and dried. 

A filtered solution, prepared by heating mercuric oxide with a slight excess of perchloric acid, after standing for several months precipitated a little unidentified white solid. This (but not the supernatant liquid) was very shock sensitive, and detonated as it was being rinsed out with water. (Traces of a volatile amine may have been absorbed into the acid liquor to give an amminemercury perchlorate, expected to be explosive). 

Me er s test Bromocriptine mesilate is dissolved in methanol/water 3 10. After addition of one drop of diluted hydrochloric acid and one drop of Meyer s reagent (mercuric potassium iodide) and shaking, a white precipitate is produced. 

Mercury chloride is obtained as a white precipitate by adding a cold acidic solution of sodium chloride or other soluble chloride to a solution of mercurous salt, such as mercury nitrate ... 

Phosphorus acid is a powerful reducing agent. When treated with a cold solution of mercuric chloride, a white precipitate of mercurous chloride forms ... 

In 1803 Dr. Wollaston succeeded in separating two new metals from platinum. He dissolved the crude metal in aqua regia, evaporated off the excess acid, and added a solution of mercuric cyanide, drop by drop, until a yellow precipitate appeared. When this substance was washed and ignited, a white metal remained. By heating the yellow precipitate with sulfur and borax he also succeeded in obtaining a button of the new metal, which he named palladium in honor of the recently discovered asteroid, Pallas (6). 

To 1 1. of boiling water in a 3-I. beaker or large evaporating dish (Note 1) is added 150 g. of mercuric chloride to this mixture is then added, with good stirring, 116 g. of sodium />-toluene-sulfinate (Vol. II, p. 89). A thick, white, curdy precipitate forms at once (Note 2), and in a short time sulfur dioxide is evolved copiously. The heating and stirring are continued until no more sulfur dioxide is evolved, which requires about two hours. 

A similar deposition, only carried ont nnder alkaline conditions (with added ammonia) at pH 11 and at 65°C, was described [153], According to this study, simple mixing of a mercuric salt solution with thiosnlphate results in immediate formation of a black precipitate of HgS. By first treating the Hg solution with aqueous ammonia, a white precipitate formed by the following reaction ... 

When sulphide of hydrogen gas is passed to saturation through a solution of protoxide of meroury, the white compound which appears at an early Btage of the operation is destroyed, and the black precipitate then consists solely of mercuric sulphide, which, when collected, dried, and heated in a retort, yields a fine crystalline sublimate of cinnabar. These two bodies, therefore, the black and the red, are allotropio modifications of one substance, Hg S. 

---