Question 1:
Write the cell notation for the following voltaic cells:
$$
\begin{aligned}
& \mathrm{Sn}^{2+} / \mathrm{Sn} \text { and } \mathrm{Mg}^{2+} / \mathrm{Mg} . \\
& \mathrm{Cl}_2 / \mathrm{Cl}^{-} \text {and } \mathrm{MnO}_4^{-} / \mathrm{Mn}^{2+} .
\end{aligned}
$$
Answer:
(a)
$$
\operatorname{Mg}(\mathrm{s})\left|\mathrm{Mg}^{2+}(\mathrm{aq})\right|\left|\mathrm{Sn}^{2+}(\mathrm{aq})\right| \operatorname{Sn}(\mathrm{s})
$$
Write the cell notation for the following voltaic cells:
$$
\begin{aligned}
& \mathrm{Sn}^{2+} / \mathrm{Sn} \text { and } \mathrm{Mg}^{2+} / \mathrm{Mg} . \\
& \mathrm{Cl}_2 / \mathrm{Cl}^{-} \text {and } \mathrm{MnO}_4^{-} / \mathrm{Mn}^{2+} .
\end{aligned}
$$
Answer:
(a)
$$
\operatorname{Mg}(\mathrm{s})\left|\mathrm{Mg}^{2+}(\mathrm{aq})\right|\left|\mathrm{Sn}^{2+}(\mathrm{aq})\right| \operatorname{Sn}(\mathrm{s})
$$
(b)
$$
\operatorname{Pt}(\mathrm{s})\left|\mathrm{Cl}^{-}(\mathrm{aq}), \mathrm{Cl}_2(\mathrm{aq})\right|\left|\mathrm{MnO}_4^{-}(\mathrm{aq}), \mathrm{Mn}^{2+}(\mathrm{aq})\right| \operatorname{Pt}(\mathrm{s})
$$
Question 2:
Calculate the voltage for the following cells:
$$
\text { (a) } \mathrm{Ni}(\mathrm{s})\left|\mathrm{Ni}^{2+}(\mathrm{aq}) \| \mathrm{Pb}^{2+}(\mathrm{aq})\right| \mathrm{Pb}(\mathrm{s}) \text {. }
$$
$$
\text { (b) } \operatorname{Pt}(\mathrm{s})\left|\mathrm{I}^{-}(\mathrm{aq}), \mathrm{I}_2(\mathrm{aq}) \| \mathrm{Ag}^{+}(\mathrm{aq})\right| \operatorname{Ag}(\mathrm{s}) \text {. }
$$
$$
\text { (c) } \mathrm{Pt}(\mathrm{s})\left|\mathrm{Fe}^{2+}(\mathrm{aq}), \mathrm{Fe}^{3+}(\mathrm{aq}) \| \mathrm{Ag}^{+}(\mathrm{aq})\right| \mathrm{Ag}(\mathrm{s}) \text {. }
$$
$$
\text { (d) } \operatorname{Pt}(\mathrm{s})\left|\mathrm{Br}^{-}(\mathrm{aq}), \mathrm{Br}_2(\mathrm{aq}) \| \mathrm{Cl}_2(\mathrm{aq}), \mathrm{Cl}^{-}(\mathrm{aq})\right| \operatorname{Pt}(\mathrm{s}) \text {. }
$$
Calculate the voltage for the following cells:
$$
\text { (a) } \mathrm{Ni}(\mathrm{s})\left|\mathrm{Ni}^{2+}(\mathrm{aq}) \| \mathrm{Pb}^{2+}(\mathrm{aq})\right| \mathrm{Pb}(\mathrm{s}) \text {. }
$$
$$
\text { (b) } \operatorname{Pt}(\mathrm{s})\left|\mathrm{I}^{-}(\mathrm{aq}), \mathrm{I}_2(\mathrm{aq}) \| \mathrm{Ag}^{+}(\mathrm{aq})\right| \operatorname{Ag}(\mathrm{s}) \text {. }
$$
$$
\text { (c) } \mathrm{Pt}(\mathrm{s})\left|\mathrm{Fe}^{2+}(\mathrm{aq}), \mathrm{Fe}^{3+}(\mathrm{aq}) \| \mathrm{Ag}^{+}(\mathrm{aq})\right| \mathrm{Ag}(\mathrm{s}) \text {. }
$$
$$
\text { (d) } \operatorname{Pt}(\mathrm{s})\left|\mathrm{Br}^{-}(\mathrm{aq}), \mathrm{Br}_2(\mathrm{aq}) \| \mathrm{Cl}_2(\mathrm{aq}), \mathrm{Cl}^{-}(\mathrm{aq})\right| \operatorname{Pt}(\mathrm{s}) \text {. }
$$
Jawapan:
(a)
$$
\mathrm{E}_{\text {cell}}^0=(+0.13)-(-0.25)=+0.12 \mathrm{~V}
$$
(b)
$$
\mathrm{E}_{\text {cell }}^0=(+0.80)-(+0.54)=+0.26 \mathrm{~V}
$$
(c)
$$
\mathrm{E}_{\text {cell }}^0=(+0.80)-(+0.77)=+0.03 \mathrm{~V}
$$
(d)
$$
\mathrm{E}_{\text {cell }}^0=(+1.36)-(+1.07)=+0.29 \mathrm{~V}
$$