Dental amalgam, a solid solution of silver and tin in mercury, was used for filling tooth cavities. Two of the reduction halfreactions that the filling can undergo are

Suggest a reason why, if you accidentally bite on a piece of aluminum foil with a tooth containing a silver filling, you may feel pain.
Write a balanced chemical equation to support your suggestion.

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3 Hg+(aq) + 4 Ag(s) +6 e2 AgHg3 (s) 2+ Sn (aq) + 3 Ag(s) + 2 e Ag3Sn(s) E= +0.85 V -0.05 V E =