# Physical and Chemical Properties of Silver

Physical properties:

•  It is white metal with high malleability and ductility.
•  It is a good conductor of heat and electricity.
•  The density of silver is 10.52gm/cc.
•  The melting point of silver is 956oC and boils at 1955oC.

Chemical properties:

1. Action with air: Since silver is an inert metal, it does not react with air. But it is tarnished when exposed to air containing traces of silver.
$$\ce{2Ag + H2S->\underset{\text{Black ppt }}{\ce{Ag2S v }} + H2}$$

2. Action with acids: Dilute HCl and dilute H2SO4 has no effect on silver. When it is treated with conc. HCl, a film of insoluble AgCl is formed on its surface which prevents the further reaction with silver. It gives sulphur dioxide when reacted with concentrated H2SO4.
$$\ce{2Ag + conc. 2H2SO4->[\Delta]Ag2SO4 + SO2 ^ + 2H2O}$$
$$\ce{3Ag + dil. HNO3->3AgNO3 + NO ^ + 2H2O}$$
$$\ce{Ag + conc. 2HNO3->AgNO3 + NO2 ^ + H2O}$$

3. Action with non-metals: Sulphur and chlorine react with silver to give sulphide and chloride.
$$\ce{2Ag + S->[\Delta]Ag2SO4 + SO2 ^ + 2H2O}$$
$$\ce{2Ag + Cl2->[\Delta]2AgCl}$$

Uses:

• It is used as ornament and coins.
• It is used in silver plating.
• Silver salts are used in photography.
• It is used in dental fillings and other medical purposes.

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