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Question

Write the Nernst equation and emf of the following cells at 298 K:
(i) Mg(s)|Mg+2(0.001 M)Cu+2(0.0001 M)|Cu(s).
(ii) Fe(s)|Fe+2(0.001 M)H+(1M)|H2(g)(1bar)|Pt(s)
(iii) Sn(s)|Sn2+(0.050 M)H+(0.020 M)|H2(g)(1bar)|Pt(s)
(iv) Pt(s)|Br2(l)|Br(0.010 M)H+(0.030 M)|H2(g)(1bar)|Pt(s).

Solution
Verified by Toppr

(i) Eo=0.34(2.37)=2.71 V
E=E00.059nlog[Mg2+][Cu2+]
E=2.710.0592log0.001(0.0001)
E=2.6805 V
(ii) Eo=0(0.44)=0.44 V
E=E00.059nlog[Fe2+][H+]2
E=0.440.0592log0.001(1)2
E=0.5285 V
(iii) Eo=0(0.14)=0.14 V
E=E00.059nlog[Sn2+][H+]2
E=0.140.0592log0.050(0.020)2
E=0.08 V
(iv) Eo=01.08=1.08 V
E=E00.0592log1[Br]2[H+]2
E=1.080.0592log1(0.01)2(0.030)2
E=1.288 V

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Write the Nernst equation and emf of the following cells at 298 K:
(i) Mg(s)|Mg+2(0.001 M)Cu+2(0.0001 M)|Cu(s).
(ii) Fe(s)|Fe+2(0.001 M)H+(1M)|H2(g)(1bar)|Pt(s)
(iii) Sn(s)|Sn2+(0.050 M)H+(0.020 M)|H2(g)(1bar)|Pt(s)
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