The products of electrolysis of concentrated aqueous solution of sodium chloride are sodium hydroxide, hydrogen gas and chlorine gas.
What is electrolysis?
By passing a direct electric current through an ionic compound in fluid form, electrolysis is the process of breaking down the substance into its constituent elements. Anions are oxidized at the anode while cations are reduced at the cathode. An electrolyte, electrodes, and some sort of external power source are the essential components needed to perform electrolysis.
Several large compounds with industrial use, such as sodium hydroxide and chlorine, are produced by an important process called sodium chloride electrolysis. It is possible to electrolyze sodium chloride in aqueous solutions or in a molten state. In order to speed up the redox processes, extra salts are also present when electrolysis is performed.
The electrolysis of a concentrated solution of NaCl gives (I) Cl2, (II) NaOH (aq) and (III)H 2 (g).
[tex]2NaCl (aq) + 2H2O[/tex] → [tex]2NaOH (aq) + H2(g) + Cl2 (g)[/tex]
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