When concentrated sodium chloride solution is electrolysed using inert electrodes the products are?

Assessment: WAEC SSCE - Chemistry - 2002 (Objective) Subject: Chemistry

Question 1 Report

When concentrated sodium chloride solution is electrolysed using inert electrodes the products are?

Answer Details
When concentrated sodium chloride solution is electrolysed using inert electrodes, the products are hydrogen and chlorine gases. This process is known as the electrolysis of brine. At the cathode (negative electrode), hydrogen ions (H+) from water are reduced to hydrogen gas (H2). At the anode (positive electrode), chloride ions (Cl-) from sodium chloride are oxidized to form chlorine gas (Cl2). The sodium ions (Na+) and hydroxide ions (OH-) produced by the electrolysis of water remain in solution and react to form sodium hydroxide (NaOH). Therefore, the correct option is "sodium hydroxide, hydrogen, and chlorine" but it is not listed as an option. The closest option is "hydrogen and chlorine."
Read lesson note on Electrolysis (JAMB)
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