Question: Consider the following half reactions: Pt2+ + 2e Pt o = 1.188 V PtCl42 + 2e Pt + 4Cl2 o = 0.755 V

Consider the following half reactions:
Pt2+ + 2e– → Pt ϐo = 1.188 V
PtCl42– + 2e– → Pt + 4Cl2 ϐo = 0.755 V
NO3- + 4H+ + 3e– → NO + 2H2O ϐo = 0.96 V
Explain why platinum metal will dissolve in aqua regia (a mixture of hydrochloric and nitric acids) but not in either concentrated nitric or concentrated hydrochloric acid individually.

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