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Silver Nitrate The Physical And Chemical Properties

Silver nitrate is a colorless crystal that is soluble in water. Pure nitric acid is stable in light, but its aqueous solution and solids are often stored in brown reagents because of the lack of purity. Used for photographic emulsion, silver-plated, mirror, printing, medicine, hair dye, chlorine ion, bromide ion and iodide, etc., also used in electronic industry.

The physical and chemical properties

Physical properties

Colorless and transparent oblique crystal lamellar crystal, soluble in water and ammonia, soluble in ether and glycerin, slightly soluble in anhydrous ethanol, almost insoluble in concentrated nitric acid. Its aqueous solution is weakly acidic. The silver nitrate solution is highly oxidized and has a corrosive effect because it contains a large amount of silver ions. It is used in the medical treatment of the granulation tissue of the hyperplasia, and the dilute solution is used for the fungicide of eye infection. After melting, the light yellow liquid is still white after curing.

Chemical properties

Silver nitrate is black with organic matter and decomposed into silver. Pure nitric acid is stable in light, but its aqueous solution and solids are often stored in brown reagents because of the lack of purity. Silver nitrate decomposed into silver when heated to 440 ℃, nitrogen, oxygen and nitrogen dioxide. The aqueous solution and ethanol solution have a neutral reaction to the litmus, with a pH of about 6. The boiling point of 444 ℃ (decomposition). It's oxidizing. In the presence of organic matter, see light grey or black. Silver nitrate can react with a series of reagents in reaction or coordination reaction (see coordination compound). For example, with hydrogen sulfide reaction, black sulfide Ag2S precipitation is formed. With potassium chromate, red and brown chromate Ag2CrO4 precipitation was formed. With the reaction of disodium hydrogen phosphate, yellow Ag3PO4 precipitation was formed. The halogenated silver AgX precipitation is formed with the halogen ion reaction. It can also function with alkali to form the black oxide Ag2O precipitation. The white oxalate Ag2C2O4 precipitation was formed with the action of oxalate ion. The silver nitrate can react with NH3, CN- and SCN- to form various coordination molecules.

Role purpose

The analytical chemistry was used to precipitate the chloride ion, and the benchmark nitrate was used to calibrate the sodium chloride solution. The inorganic industry is used to make other silver salts. Electronic industry is used to make conductive adhesive, new gas purifying agent, A8x molecular sieve, silver-plated uniform and electric work gloves, etc. The light-sensitive industry is used to make photosensitive materials such as film, X-ray and photographic film. The plating industry is used for the silver plating of electronic components and other handicrafts, as well as a large amount of silver-plated material used in mirrors and insulating bottles. The battery industry is used to produce silver-zinc batteries. Medicine is used as fungicide, caustic agent. The daily chemical industry is used to dye hair and so on. Analytical chemistry is used to determine chlorine, bromine, iodine cyanide and thiocyanate. [3]

It is used for the non-cyanide silver plating, such as sulfuric acid plating silver, hydrochloric acid plating silver, aminodisulfonate silver, sulfonyl salicylic acid plating silver, etc. It's the silver ion source. The content of silver nitrate has some influence on the conductivity, dispersibility and precipitation speed of silver-plated liquid. The usual dosage is 25-50g/L.

The ammonia solution of silver nitrate can be reduced by organic reducer aldehyde and sugar. So it's a reagent that checks for aldehyde and sugar. It is also used for determination of chloride ion, catalyst for determination of manganese, electroplating, photography and porcelain coloring.

Danger that

Silver nitrate is a powerful oxidant, corrosive and environmental pollutant. Mixing with some organic matter or sulfur or phosphorus, and the impact can be burnt or explosive; Silver nitrate is corrosive. Once the skin is in a silver nitrate solution, black spots appear, thanks to the production of the black protein silver. Silver nitrate is toxic, ld50mg/kg, and lethal amount is about 10 grams.


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