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Preparation of looking mirrors involves ...

Preparation of looking mirrors involves the use of ammonical `AgNO_3` , red lead and HCHO. Explain the function of each.

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The process of depositing a thin uniform layer of silver on clear glass surface is called silvering of mirror. The thin film is prepared by coating of red lead and turpentine mixture,
`2AgNO_(3) + 2NH_(4)OHtoAg_(2)O+2NH_(4)NO_(3)+H_(2)O`
`Ag_(2)O+HCHOto2Ag + HCOOH`.
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