Dental amalgam a solid solution of silver and tin in, Ask an Expert

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

3Hg2 2+(aq) + 4Ag(s) + 6e- ---> 2Ag2Hg3(s) Eo = +0.85 V
Sn2+(aq) + 3Ag(s) + 2e- -? Ag3Sn(s) Eo = - 0.05V

Suggest a reason why, when you accidently bite on a piece of aluminium 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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