Mercuric nitrate solution

Mercuric nitrite reaction (Millon s reaction). Dissolve a very small crystal of tyrosine in i ml. of water, add 1-2 drops of mercuric nitrate solution, and I drop of dil. HjSO, and then boil. Cool, add i drop of sodium nitrite solution and warm again a red coloration is obtained. 

Mercurous Sulfate. Mercurous s Ai2LX.e[7783-36-0] Hg2S04, is a colodess-to-shghfly-yellowish compound, sensitive to light and slightly soluble ia water (0.05 g/100 g H2O). It is more soluble ia dilute acids. The compound is prepared by precipitation from acidified mercurous nitrate solution and dilute sulfuric acid. The precipitate is washed with dilute sulfuric acid until nitrate-free. Its most important use is as a component of Clark and Weston types of standard cells. 

In the titrmetric procedure, the serum is diluted in 0.07 N nitric acid and titrated with a dilute mercuric nitrate solution in the presence of diphenylcarbazone (34). A purple color forms when excess mercury ions appear, over that needed to complex the chloride. Using an ultramicro buret this method has found wide use in the past. The microburets which are available such as the Rehburg buret are typified in Figure 22. 

Barium acetate converts to barium carbonate when heated in air at elevated temperatures. Reaction with sulfuric acid gives harium sulfate with hydrochloric acid and nitric acid, the chloride and nitrate salts are obtained after evaporation of the solutions. It undergoes double decomposition reactions with salts of several metals. For example, it forms ferrous acetate when treated with ferrous sulfate solution and mercurous acetate when mixed with mercurous nitrate solution acidified with nitric acid. It reacts with oxahc acid forming barium oxalate. 

Mercury Arsenites.—Mercurous Orthoarsenite, Hg3As03, may be obtained by treating a solution of mercurous nitrate with one of sodium orthoarsenite6 or with a solution of arsenious oxide in 50 per cent, alcohol 6 in the latter case the mercurous nitrate solution should be acidified with nitric acid and sufficient alcohol added to produce a slight turbidity. The precipitate is pale yellow, but rapidly turns brown on exposure to air. It is slightly soluble in water, being slowly decomposed with separation of mercury. It is also decomposed by hydroxides and carbonates of alkali metals and of barium, and by ammonia. It dissolves in acids, but when these are dilute, basic salts gradually separate. 

Mercurous Metarsenite, HgAs02, separates as a yellowish precipitate when potassium tetrarsenite is gradually added to mercurous nitrate solution.6 The salt is dried at 125° C. It is unstable and is decomposed by excess of the alkali arsenite, by alkali hydroxides and by aqueous ammonia. 

Mercuric Orthoarsenate, Hg8(As04)2, is obtained by precipitating a solution of mercuric nitrate with a solution of sodium mono- or dihydrogen arsenate, or by dropping aqueous arsenic acid into excess of mercuric nitrate solution.4 It is a heavy citron-yellow powder. Hot water dissolves it slightly without decomposition, and shining crystals may separate from the cooled solution. Hydrochloric acid dissolves it freely, nitric acid less readily, and arsenic acid not at all. Brine solution converts it into red-brown mercury oxychloride. Potassium bromide solution colours it brown, and a yellow residue is ultimately left. Potassium iodide forms mercuric iodide. 

Salicylic Acid, ioo c.c. of the milk are shaken with ioo c.c. of hot water (6o°), 8 drops of acetic acid and 8 drops of mercurous nitrate solution and filtered, the filtrate being shaken with 50 c.c. of a mixture of ether and petroleum ether in equal volumes. The ethereal layer is then separated and the solvent evaporated, the residue being dissolved in a little water and treated with a few drops of a recently prepared 005% ferric chloride solution a violet coloration indicates salicylic add. 

Snated filter, e.g., a glass fiber mat impregnated with a mercurous salt ition and a humectant (29). Although detectabilities well below 100 pptv were obtainable, batch to batch filter performance showed marked variability and impregnated filters could not be stored over a month-long period without loss of performance. We therefore carried out the desired reaction using a diffusion scrubber air was sampled through a porous hydrophobic membrane tube while a dilute mercurous nitrate solution was circulated on the outside of the membrane tube. Mercury liberated by reaction at the gas-liquid interface in the pores is carried by the air stream to the detector. 

Silicon bronzes Susceptible to cracking in steam and mercurous nitrate solution silicon bronzes (Cu-Si-Mn, Cu-Si-Sn, Cu-Si-Zn), susceptible to intergranular cracking in ammonia medium... 

Nickel silvers Cu-Zn-Ni alloys containing 5, 10 and 15% Ni did not crack in mercurous nitrate solution for 7 days... 

Colour Test. To a 2% solution in water, add 1 ml of dilute nitric acid and 3 ml of mercuric nitrate solution and heat to boiling— yellow or yellow-green. 

Mercuric Nitrate Solution dissolve 40 g of mercuric oxide (red or yellow) m a mixture of 32 ml of mtnc acid and 15 m 1 of water Store m glass containers protected from light... 

It follows, therefore, that a ten-fold change of concentration of the ions will produce a change of 0.058/2, volt in the electrode potential, where Zi is the valence of the ions with respect to which the electrode is reversible. It is possible, therefore, to utilize equation (47) to determine the valence of an ion. For example, the result of a ten-fold change in the concentration of a mercurous nitrate solution was found to cause a change of 0.029 volt in the potential of a mercury electrode at 17 it is evident, therefore, that z must be 2, so that the mercurous ions are bivalent. These ions are therefore written as Hgt" and mercurous chloride and nitrate are represented by Hg2Cl2 and Hg2(N08)2. 

Experiment i66. — (a) Mercurous. Add a few drops of hydrochloric acid to a little mercurous nitrate solution. The white precipitate is mercurous chloride. Note its insolubility in water and in dilute hydrochloric acid. Add a few drops of ammonium hydroxide. The black precipitate is mainly mercurous ammonium chloride. Its formation is a delicate test for mercury in mercurous compounds. 

Experiment 194. — Mix 5 cc. each of lead nitrate, silver nitrate, and mercurous nitrate solutions, and add dilute hydrochloric acid drop by drop, until precipitation ceases. Separate and test the lead as in Exp. 193. Pierce a hole in the point of the filter paper with a glass rod, and wash the mixed precipitates of silver and mercurous chlorides into a test tube with dilute ammonium hydroxide. Warm gently and shake. Filter, and test the filtrate for silver as in Exp. 193. The black residue (see Exp. 166 (<2)).is a sufficient test for mercury. Its presence may be confirmed thus Dissolve the black precipitate in a very little aqua regia, dilute with water, and add a clean copper wire remove the wire in a few minutes, wipe gently, and mercury will be seen on the wire as a bright silvery coating. 

Mercurous nitrate, Hgo(N03)., is formed by reduction of a mercuric nitrate solution with mercury ... 

Mercurous chloride, Hg2Cl2, is an insoluble white crystalline sub stance obtained by adding a solution containing chloride ion to a mercurous nitrate solution ... 

When an alkali chloride or nitrate is added to a solution of the acid, or w hen solutions of the tetrabasic salts are treated with hydrochloric add, yellow salts of formula R 3H5[Si(Mo207)8].a H20 (R =Na, K, Ag) are obtained. Attempts to produce the normal alkali and guanidinium salts have not been successful, but on addition of concentrated sUver or mercurous nitrate solutions to a solution of the tetrabasic sodium salt, yellow crystalline precipitates, of composition Ag8[Si(Mo20-)6].15H,0 and Hgg[Si(Mo207)6], are obtained. ... 

Detection of jS Chlorovinyl Dichloroarsine When a few drops of mercurous nitrate solution, slightly acidified with nitric acid, are added to a solution containing ]8 chlorovinyl dichloroarsine, a white precipitate forms which turns grey within 12 hours. 

When boiling mercuric nitrate solution is saturated with acetylene the composition of the precipitate is HgC CHg.HgNOg.HgO. This yields acetaldehyde when treated with dilute acids. 

If the mercuric nitrate solution contains an excess of potassium nitrite and 1 per cent, nitric acid and acetylene be passed into the cold mixture, mtritoHliynercuracetaldehycU is precipitated as a bright yellow powder. It is explosive, and is proved to be a nitrite by its behaviour towards a-naphthy]amine in the presence of acetic and hydrochloric aeids. ... 

Anodic stripping voltammetry (ASV) with the tubular mercury graphite electrode (TMGE) possesses adequate sensitivity and precision under repeated use to characterize zinc in San Diego Bay water. The TMGE, made by electrolysis of a mercuric nitrate solution to form a thin mercury film inside a graphite tube, is described elsewhere (I). 

The automated system is controlled by a specially designed programmer which controls the potentiostat, the recorder, two peristaltic pumps, and five solenoid-operated valves which alternately circulate a mercuric nitrate solution, a seawater sample, or a standard solution through the electrode assemblage. Automated analyses for copper, zinc, cadmium, and lead were made on the pier of the Scripps Institution of Oceanography, San Diego, Calif., and aboard ship in Puget Sound, Wash. This report describes the automated system, discusses the performance of the electrode imder continued use, and presents the results obtained in the field. 

One of the earliest methods for determining CP in biological fluids is mentioned here for historical purposes. A protein-free filtrate of specimen is titrated with mercuric nitrate solution in the presence of diphenylcarbazone as an indicator. Free Hg combines with CP to form soluble but essentially nonionized mercuric chloride ... 

Derivation (1) By the action of either potassium hydroxide or sodium hydroxide on mercuric chloride. (2) By the action of sodium carbonate upon mercuric nitrate solution. 

Derivation Reaction of sodium acetate with mercurous nitrate solution acidified with nitric acid. 

Derivation (1) Dissolving mercury in sulfuric acid and heating gently (2) adding sulfuric acid to mercurous nitrate solution. 

Bubble hydrogen sulphide into 5 c.c. of mercurous nitrate solution. (5) What appeared This is a mixture of mercuric sulphide and mercury. (6) What would have been formed by double decomposition (7) What does this experiment show concerning the stability of mercurous sulphide (8) What process has the mercury undergone in changing from mercurous nitrate to mercuric sulphide (9) What was reduced ... 

The mercury vapor produced by bubbling the sulfur dioxide through a mercurous nitrate solution was detected by the gold-coated crystal due to the formation of a mercury amalgam. The optimum conditions were temperature = 27°C flow rate = 55 ml/min [Hg2 ] = 4 x 10 M purge time = 10 min. The sensitivity of the detector depended on the sample size, and linear calibration curves in the concentration... 

Preparation.—The commercial product is usually obtained by simple distillation in a current of"air HgS+Os=Hg- -SOj. If required pure, it must be freed from other metals by distillation, and agitation of.the redistilled product with mercurous nitrate solution, solution of PeaCU, or dilute HJsOj. 

Silver nitrate is without effect on beryllium hydroxide. Mercuric nitrate solution is colored yellowish red by the neutral hydroxide. Authors conclude from comparison that Be(OH), has an ion solubility of the high order of lO". ... 

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