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CHEMISTRY FROM 4 SCIENCE

CHAPTER 1 : ELECTROLYSIS

ELECTROLYSIS OF CONCENTRATED HDRO CHLORIC ACID

Ions present: H+,Cl- from HCL

                             H+, OH- from H2O

During electrolysis, hydrogen ions move to the cathode while Cl- and OH- ions move to the anode.

At the cathode, the hydrogen ions are discharged as hydrogen gas.

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The hydrogen gas then passes through tube B and is collected over saturated of calcium chloride.

At the anode: chloride ion are discharged in preference to OH- ion because of their high concentration in solution. The Cl- ion are discharged as chlorine gas.

The chlorine gas passes through tube ‘a’ and is collected over saturated solution of calcium chloride.

par Claude Foumtum
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