Chem T3 - Predicting products of electrolysis
- Created by: Claudiacumberpatch
- Created on: 10-03-20 20:38
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- Predicting products of electrolysis
- In molten ionic solids only 1 source ions
- 1. Ionic solid can't be electrolysed as ions are in fixed positions & can't move.
- 2.) Molten ionic compounds can be electrolysed as ions can move freely & conduct electricity
- 3.) Positive metal ions are reduced to metal atoms at cathode
- 4.) Negative ions oxidised to atoms or molecules at anode
- 5.) e.g. PbBr? see brown vapour of bromine gas at anode, silver coloured liquid at cathode as molten lead is formed
- Electrolysis Aqueous solutions (more complicated)
- 1.) In aqueous solutions aswell as ions from ionic compound, hydrogen ions (H ) & hydroxide ions (OH ) present from water
- Cathode reaction rules: Always hydrogen H? discharges unless aqueous metal ion less reactive then hydrogen
- Anode reaction rules: Always oxygen O? unless anion (negative ion) from dissolved compound is chloride bromide or iodide (halide ions)
- In molten ionic solids only 1 source ions
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