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The Ag article when rubbed with toothpaste again starts shining.Why?
Answers
Silver metals develop a black layer of silver sulphide and reacts with hydrogen sulphide present in atmosphere.For help equation-
Ag+H₂S⇒Ag₂S+H₂
The phenomenon involved is corrosion of silver metal.Silver sulphide(Ag₂S) is the black substance formed
Toothpaste is abrasive. It typically contains 50% of one or more of these - checking a few packages here - calcium hydrogen phosphate, “microbeads” of unspecified nature (probably silica), calcium carbonate, hydroxyapatite, aluminum hydroxide, hydrated silica. It’s like brushing your teeth with extremely fine sandpaper. Naturally it works just as well on metals, to remove a surface oxide film. I’ve used it to polish out scratches in DVDs. But it still leaves dull areas of fine scratches behind, so you’re better off using a finer abrasive like jeweler’s rouge, which consists of iron oxide in a grease binder.
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