- null - Galvanic Cells - Measurement of Electrode Potential
Write the cell reaction and calculate the e.m.f of the following cell at 298 K:
`Sn(s) | Sn^(2+) (0.004 M) || H^(+) (0.020 M) | H_2 (g) ("1 bar") | Pt(s)`
(Given: `E_(Sn^(2+)"/"Sn)^0 = -0.14` V)
Consult the table of standard electrode potentials and suggest three substances that can oxidise ferrous ions under suitable conditions
Calculate the standard cell potentials of galvanic cells in which the following reactions take place:
(i) 2Cr(s) + 3Cd2+(aq) → 2Cr3+(aq) + 3Cd
(ii) Fe2+(aq) + Ag+(aq) → Fe3+(aq) + Ag(s)
Calculate the ΔrGθ and equilibrium constant of the reactions.
Account for the following:
E° value for the Mn3+/Mn2+ couple is highly positive (+1.57 V) as compare to Cr3+/Cr2+.