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To determine Eᵣₑ° based on Sn²⁺/Sn = 0.0V for each of the cells measured: (What do you have to add OR subtract from Eᵣₑ° for Sn²⁺/Sn based on S.H.E. to make its value =0 ?)
Ag¹⁺/Ag____, Co²⁺/Co____, Cu²⁺/Cu___, Cd²⁺/Cd___, Cr³⁺/Cr___, Sn²⁺/Sn___