Physical and chemical properties and use of silver

I. Physical and chemical properties of silver Silver Ag is rare in the earth's crust, accounting for only 1 × 10 -5 %. There is a single natural silver in nature, but it is mainly produced in the form of a compound.
Sterling silver is silvery white, melting point 960.8 ° C, boiling point 2210 ° C, density 10.49 g / cm 3 . Silver is a face-centered cubic lattice with good plasticity and is second only to gold in ductility, but it becomes very brittle when it contains a small amount of arsenic As, 锑 Sb, and 铋 Bi.
Silver has good chemical stability and does not oxidize at normal temperature. However, among all precious metals, silver is the most active chemical. It is soluble in nitric acid to form silver nitrate; soluble in hot concentrated sulfuric acid, slightly soluble in hot dilute sulfuric acid; and chlorinated on the surface in hydrochloric acid and "aqua regia" Silver film; when contacted with sulfide, black silver sulfide is formed. In addition, silver can form alloys with gold or copper in any proportion, and alloys are easily formed when fused with copper and zinc , and silver amalgam is formed by contact with mercury .
Second, the use of silver Silver has basically lost its currency function many years ago, but only an industrial metal, mainly used in industry, photography and jewelry and silver products. In the 1990s, hedging transactions only occurred twice on the demand side, and the number was not large. Manufacturing demand is basically equal to the total market demand, 70% of which are from industrial and photo uses. The only thing that still retains the traces of the currency era is the silver coin. In 1998, the silver coin only accounted for 3% of the total demand. The rest is the demand for jewelry and silverware. The EU, the United States, Japan and India are the regions with the largest amount of silver in the world, while in the EU Italy consumes the most.
The properties of silver are mainly manifested in its strength, ductility, thermal conductivity and electrical conductivity, as well as its sensitivity to light reflection. Although silver is considered a precious metal, its basic role is for catalysts and photographs. And its combination of multiple advantages determines that in most of its applications, it is difficult to find other alternatives, especially in high-tech areas where reliability, accuracy and safety are overwhelming.

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