Polishing Silver tarnish is the result of silver metal reacting with sulfur comp

Question

Polishing Silver tarnish is the result of silver metal reacting with sulfur compounds, such as H_2 S, in the air. The tamish on silverware (Ag_2 S) can be removed by soaking in a solution of NaHCO_3 (baking soda) in a basin lined with aluminum foil. Write a balanced equation for the tarnishing of Ag to Ag_2 S. Do not include phases. How many moles of electrons are transferred per mole of silver? Write a balanced reaction for the reaction of Ag_2 S with Al metal and H_2 O to produce AI(OH)_3, H_2 S, and Ag metal. Do not include phases.

Explanation / Answer

1) A balanced equation for the tarnishing

4Ag + O2 + 2H2S 2Ag2S + 2H2O

2) The oxidation number of Ag increases from 0 to +1, so this is an oxidation reaction.

2 Ag 2 Ag+ + 2 e-

For 2 moles of silver, 2 moles of electrons are transferred

So, 1 mole of electrons are transferred per mole of silver

Electrons are transferred per mole of silver-   

1mol e^-/mol Ag   

3) The balanced equation for the reaction -

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

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