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Question -

Write the Nernst equation and emf of the following cells at 298 K:



Answer -

(i) Mg(s) |Mg2+(0.001M) || Cu2+(0.0001 M) | Cu(s)

(ii) Fe(s) |Fe2+(0.001M) || H+(1M)|H2(g)(1bar) | Pt(s)

(iii) Sn(s) |Sn2+(0.050 M) || H+(0.020 M) | H2(g) (1 bar) |Pt(s)

(iv) Pt(s)| Br2(l) | Br−(0.010 M) || H+(0.030 M)| H2(g) (1 bar) | Pt(s).

Answer

(i) Forthe given reaction, the Nernst equation can be given as:

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