Looking for A, B, and C. Thanks! Silver tarnish is mainly Ag2S: Ag,S(s) 2e -2Ag(

Question

Looking for A, B, and C. Thanks!

Silver tarnish is mainly Ag2S: Ag,S(s) 2e -2Ag(s) + S*(aq) A tarnished silver spoon is placed in contact with a commercially available metallic product in a glass baking dish. Boiling water, to which some NaHCO3 has been added, is poured into the dish, and the product and spoon are completely covered. Within a short time, the removal of tarnish from the spoon begins E°- -0.691 V a) What metal or metals are in the product? b) What is the probable reaction that occurs? c) What do you predict is the function of NaHCO3? d) An advertisement for the product appears to make two claims: 1) No chemicals are involved and 2) the product will never need to be replaced. How valid do you think thinks claims are? Explain your answer.

Explanation / Answer

Silver tarnish is due to Ag2S on the surface of Silver

a) metals present in product are Ag in metallic form.

b) Probable reaction

with Al being used as commercial metallic product

3Ag2S + 2Al + 6H2O --> 2Al(OH)3 + 6Ag + 3H2S

c) NaHCO3 is used to dissolve the Al used as reducing agent in the reaction.

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