Silver Nitrate Colorless Crystals

- Nov 01, 2017-

Silver nitrate is a colorless crystal, soluble in water. Pure silver nitrate is stable to light, but because of the general product purity is not enough, its aqueous solution and solid are often stored in the brown reagent bottle. For photographic emulsion, silver, mirror, printing, medicine, dyeing hair, test chloride, bromide and iodide, etc., also used in the electronics industry.

Physical properties

Colorless transparent orthorhombic lamellar crystal, soluble in water and ammonia, soluble in ether and glycerol, slightly soluble in ethanol, almost insoluble in concentrated nitric acid. The aqueous solution was weakly acidic. Silver nitrate solution contains a lot of silver ions, so the oxidation is strong, and a certain corrosive, medical for the proliferation of granulation tissue, dilute solution for eye infections fungicide. After melting for the light yellow liquid, after curing is still white.

Chemical properties

Silver nitrate in the case of organic matter gray black, decomposition of silver. Pure silver nitrate is stable to light, but because of the general product purity is not enough, its aqueous solution and solid are often stored in the brown reagent bottle. Silver nitrate is heated to 440 ° C to decompose into silver, nitrogen, oxygen and nitrogen dioxide. The aqueous solution and the ethanol solution were neutral to the litmus and the pH was about 6. The boiling point of 444 ° C (decomposition). There is oxidation. In the presence of organic matter, see the light becomes gray or grayish black. Silver nitrate reacts with a series of reagents for precipitation or coordination (see coordination compounds). For example, with hydrogen sulfide reaction, the formation of black silver sulfide Ag2S precipitation; with potassium chromate reaction, the formation of reddish brown silver chromate Ag2CrO4 precipitation; with sodium hydrogen phosphate reaction, the formation of yellow silver phosphate Ag3PO4 precipitation; reaction with halogen ions, To form silver halide AgX precipitate. But also with the role of alkali, the formation of brown black silver oxide Ag2O precipitation; with the role of oxalate ions to form white silver oxalate Ag2C2O4 precipitation. Silver nitrate can react with NH3, CN-, SCN- and so on to form various coordination molecules.

Acting use

Analytical chemistry for the precipitation of chloride ions, the working standard of silver nitrate for calibration of sodium chloride solution. Inorganic industry for the manufacture of other silver salts. The electronics industry is used in the manufacture of conductive adhesives, new gas purifiers, A8x molecular sieves, silver-plated and gloved gloves. Photographic industry for the manufacture of film, x-ray film and photographic film and other photographic materials. The electroplating industry is used for silver plating of electronic components and other handicrafts, and is also used as a silver-plated material for mirrors and thermoses. The battery industry is used to produce silver-zinc batteries. Medicine used as a fungicide, corrosion agent. Japanese chemical industry for dyeing hair and so on. Analytical chemistry is used to determine chlorine, bromine, iodine cyanide and thiocyanate.

For non-cyanide silver, such as thio sulfuric acid silver plating, silver plating silver, silver imide disulfide silver, silver sulfosalic acid silver and other main salt. Is the source of silver ions. Silver nitrate content on the silver plating solution conductivity, dispersion and precipitation rate have a certain impact. The general dosage is 25-50g / L.

The aqueous solution of silver nitrate can be reduced by organic reductant aldehydes and sugars. So it is the reagent to test aldehydes and sugars. Also used to determine the chloride ion, the determination of manganese catalyst, electroplating, photography, porcelain coloring.

Operation Precautions

Closed operation, to enhance ventilation. Operators must be specially trained to strictly observe the operating procedures. It is recommended that the operator wear a hood-type electric air filter dust respirator, wear plastic anti-virus clothing, wearing chloroprene rubber gloves, should not be dropped on the skin. Keep away from fire, heat, workplace smoking is strictly prohibited. Away from flammable and combustible. Avoid dust. Avoid contact with reducing agents, alkaloids and alcohols. Handling light to light unloading, to prevent damage to packaging and containers. Equipped with the corresponding variety and quantity of fire equipment and leakage emergency treatment equipment. Empty containers may be harmful residues.

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