Silver precipitate

Silber-niederschlag, m. silver precipitate, -ni-trat, n. silver nitrate. 

At this point, the silver and mercury(I) chlorides remain as precipitates. When aqueous ammonia is added to the solid mixture, the silver precipitate dissolves as the soluble complex ion Ag(NH3)2+ forms ... 

Each electrode compartment of a galvanic cell contains a silver electrode and 10.0 ml, of 0.10 M AgN03(aq) they are connected by a salt bridge. You now add 10.0 ml. of 0.10 M NaCl(aq) to the left-hand electrode compartment. Almost all the silver precipitates as silver chloride but a little remains in solution as a saturated solution of AgCI. The measured emf is E = +0.42 V. What is the concentration of Ag+ in the saturated solution ... 

Silver precipitates from solution when a solution is added that contains an anion that forms an insoluble silver compound (a and c). The precipitates redissolve when a solution is added that contains a species that can form a strong complex with Ag (Z> and d). 

Harvey DMR, Flowers TJ, Hall JL. Localisation of chloride in leaf cells of the halophyte Suaeda maritima by silver precipitation. NewPhytol 1976 77 319-323. 

Detection and determination.—The periodates behave towards reducing agents like the iodates. They are usually but slightly soluble in water and readily soluble in dil. nitric acid. When soln. of sodium periodate are added to barium, strontium, calcium, lead, and silver salts, precipitates of dimesoperiodates are obtained, and the mother liquor has an acid reaction—the silver salt is pale yellow, the others white—silver iodate is also white. The silver precipitate becomes dark red when boiled in water the fresh precipitate is very soluble in ammonia, the dark red... 

One of the radiometric techniques is precipitation with a radioactive reagent. For example, the halides can be precipitated with 110Ag, silver precipitated with 131I, the sulfates and chromates precipitated with 212Pb or 131Ba, while Al, Be, Bi, Ga, In, Th, U, Zr, and the rare-earth elements can be precipitated with 32P04. This method suffers from the lack of selectivity and the need to make careful corrections for self-absorption in counting the samples. 

The silver acetylides appear to have substantially covalent carbon-metal bonds and are less ionic than sodium and potassium alkynides. Silver-ammonia solution may be used to precipitate 1-alkynes from mixtures with other hydrocarbons. The 1-alkynes are regenerated easily from the silver precipitates by treatment with strong inorganic acids. It should be noted, however, that silver alkynides may be shock sensitive and can decompose explosively, especially when dry. 

The sections are thoroughly rinsed in deionized water to remove unwanted silver precipitates, dehydrated in a series of ascending concentrations of ethanol, cleared in xylene, and... 

The determination of the basic amino acids in small quantities of proteins by the silver precipitation method. Ibid., 106, 457 (1934). 

A test for reducing sugars, employing the same silver-ammonia complex used as a test for aldehydes. A positive test gives a silver precipitate, often in the form of a silver mirror. Tollens reagent is basic, and it promotes enediol rearrangements that interconvert ketoses and aldoses. Therefore, both aldoses and ketoses give positive Tollens tests if they are in their hemiacetal forms, in equilibrium with open-chain carbonyl structures, (p. 1118)... 

Separation. Tungsten is precipitated in Group I and is associated with Ag in the ammoniacal filtrate of the group separation. The filtrate is almost neutralized with dilute HC1 (any precipitate formed being kept in solution by the addition of ammonia solution), and the silver precipitated as Agl by the addition of KI solution. The filtrate is concentrated, acidified with dilute HC1, and reactions 5, 6 or 9 applied. 

The silver is dissolved from the ore by an aqueous solution of a salt, and then precipitated as metal or sulphide. The cyanide process2 is the most important of the lixiviation methods, its application having been considerably extended in recent years, especially in Mexico. The ore is very finely crushed with cyanide solution in a stamp-mill, and the sludge produced submitted to agitation and aeration in contact with cyanide solution. The liquid is separated from the ore by the aid of mechanical filters, and the silver precipitated from the clear solution by addition of zinc in the form of dust or shavings. The product is smelted with nitre, and is sometimes refined by blowing air through the molten mass. 

The Ziervogel process can be worked with argentiferous copper mattes free from lead, arsenic, antimony, and bismuth. By roasting the matte in an oxidizing atmosphere, the iron is converted into sulphate. About 700° C. this substance is decomposed, the copper being converted into sulphate. At 840° to 850° C. the copper salt is converted into cupric oxide,8 and silver sulphate simultaneously formed. At this point the roasting is stopped, the silver sulphate is extracted with hot water, and the silver precipitated by means of metallic copper. These mattes are now usually worked for copper, and the silver separated electrolytically. 

Block, R. J. The Determination of the Basic Amino Acids in Small Quantities of Proteins by the Silver Precipitation Method. J. biol. Chem. 100, 457 (1934). 

Do not pour silver residues dowm the drain Silver and silver compounds kill microorganisms in sewage treatment plants. The silver and silver residues are collected, dissolved in concentrated nitric acid and treated with hydrochloric-acid (1 1). The i Cl precipitate is allowed to settle, the mother liquor decanted off and filtered, the precipitate again treated wnth hydrochloric acid (1 1) in a beaker, and the Ag ions reduced by means of /.inc rods. I he silver precipitate formed i.s filtered, washed free of chloride ions and zinc and either fused with borax or converted to AgNOj. 

I) 40 mL of the silver nitrate solution is treated with the same amount of sodium hydroxide solution in an Erlenmeyer flask ammonia is added until the precipitate of (AgOH)aq which is initially formed redissolves completely. Samples are now placed in 4 test tubes as follows 4 mL of formaldehyde solution (test tube 1), a mixture of 2 mL of benzaldehyde and 5 mL of ethanol (test tube 2), 3 mL of pure paraldehyde (test tube 3) and a mixture of 3 mL of freshly distilled acetaldehyde with 3 mL of water (test tube 4). 5 mL of the [Ag(NH3)2] solution are added to each test tube in the cold. The solutions in test tubes 1, 2 and 4 are colored black by the silver precipitate, while paraldehyde shows no reaction. A beautiful silver mirror is formed on the lower part of test tube 3 if it is warmed slightly. 

HOAc-f-oxalacetic acid silver nitrate soln. (warm) silver precipitated 212... 

CHA/CF1E] Chao, E. E., Cheng, K. L., Stepwise titration of some anion mixtures and determination of Kjp of silver precipitates with silver ion selective electrode. Anal. Chem., 48, (1976), 267-271. Cited on pages 303, 544. 

According to this equation, how many grams of metallic silver precipitates when 0.22 gram of CH3CHO is reacted ... 

II. When it reacts with silver nitrate and ammonia, metallic silver precipitates. 

Solutions containing silver and silver precipitates should not be discarded down the drain. Place in silver waste storage container. 

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