The following reaction describes the process of removing silver tarnish, Ag2S(s), by soaking the item in a hot baking soda solution in which the container is lined with aluminum foil. 3Ag2S + 2 Al(s) + 3H2O(l) 6Ag(s) + Al2O3(s) + 3H2S(aq)
The baking soda acts to remove impurities on the surface of the aluminum foil and to improve the conductivity of the solution.
Identify the substance that is oxidized.
Identify the substance that is reduced.

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The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

The formula is (nh4)2co3