Brine is a salty solution . Sodium hydroxide<span>, </span>NaOH, is also known as lye orcaustic soda<span>. Electrolysis of concentrated </span>sodium chloride solutions<span> (</span>brine<span>) produces chlorine gas, hydrogen gas and aqueous </span>sodium hydroxide. Cl2(g)<span>is </span>produced<span> at the anode (positive electrode). H</span>2(g)<span>and </span>NaOH(aq)<span> are </span>produced<span> at the cathode (negative electrode).</span>