Balance the following oxidation-reduction reaction using the halfreaction method.
\[
\begin{array}{l}
\mathrm{Na}_{2} \mathrm{O}_{2(\mathrm{aq})}+\mathrm{CoCl}_{2(\mathrm{~s})} \rightarrow \\
\mathrm{Co}(\mathrm{OH})_{3(\mathrm{~s})}+\mathrm{Cl}_{(\mathrm{aq})}+
\end{array}
\]
\( \mathrm{Na}^{+}{ }_{(\mathrm{aq})} \) in basic solution.
[5]
