Polishing Silver Silver tamish is the result of silver metal reacting with sulfu

Question

Polishing Silver Silver tamish is the result of silver metal reacting with sulfur compounds, such as H_2S, in the air. The tamish on silverware (Ag_2S) 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_2S. Do not include phases. How many moles of electrons are transferred per mole of silver? Write a balanced reaction for the reaction of Ag_2S with Al metal and H_2O to produce Al(OH)_3, H_2S, and Ag metal. Do not include phases.

Explanation / Answer

1) Balanced equation :

   2Ag + H2S -------------------------> Ag2S + H2

2)

Ag+ + e- -------------------> Ag

one mole of electrons are needed per silver

so answer = 1 mole of electrons ( 6.02 x 10^23 electrons)

3)

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

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