Silver oxide is brown cubic crystal or brown black powder, insoluble in water, soluble in acid and ammonia water. It is easy to decompose into simple substances when heated. It will absorb carbon dioxide in the air and become silver carbonate. Mainly used in electronic industry and organic synthesis.
Silver is not easy to react with sulfuric acid, so sulfuric acid can be used to clean the copper oxide fire marks left by silver welding annealing in jewelry manufacturing. Silver easily reacts with sulfur and hydrogen sulfide to form black silver sulfide, which is often found on tarnished silver coins or other articles. Silver can react with oxygen at high temperature to produce brown-black silver oxide (it can also react at room temperature, but the speed is very slow).
In the presence of potassium bromide (KBr), metallic silver will be eroded by strong oxidants such as potassium permanganate or potassium dichromate. These compounds are used in photography to bleach visible images and convert them into silver halide, which can be removed by sodium thiosulfate and re-developed to enhance the original images.
Extended data:
Pure silver is white in color, metallic in luster with impurities, soft in quality, hardened with impurities, and grayish red in color. The melting point is 96 1.93℃, the boiling point is 22 12℃ and the density is 10.5g/cm3 (20℃). Silver is soft, flexible and malleable, second only to gold. It can be pressed into sheets and drawn into filaments. Soluble in nitric acid and sulfuric acid.
The reflectivity of silver to light reaches 9 1%. At room temperature, halogen can slowly combine with silver to form silver halide. Silver does not react with dilute hydrochloric acid, dilute sulfuric acid and alkali, but can react with strong oxidizing acid concentrated nitric acid and concentrated hydrochloric acid.
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