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ES3
Chlorine is typically manufactured by the electrolysis of brine.
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Electrolysis of brine also generates hydrogen and sodium hydroxide
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\begin{gather}
2Cl^{-}\Rightarrow Cl_{2}+2e^{-}{} \\
2H_{2}O+2e^{-}\Rightarrow 2OH^{-}+H_{2}{} \\
2Cl^{-}+2H_{2}O\Rightarrow Cl_{2}+2OH^{-}+H_{2}{}\\
\end{gather}