Electrolysis
- Created by: aribasxx
- Created on: 05-03-20 20:10
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- Electrolysis
- an electric current is passed through an electrolyte.
- molten or dissolved ions
- electroylsis of molten compounds form solids
- ionic solids can't be electrolysed because ions are in fixed positions and can't move.
- molten ionic compounds can be electrolysed because ions can move freely and conducts electricity.
- positive metal ions are reduced to the element of the cathode
- negative mental ions are oxidises to the element at the anode.
- 2Br- -----> Br2+ 2e-
- Pb2+ +2e- --> Pb
- negative mental ions are oxidises to the element at the anode.
- Metals can be extracted from their ores using electrolysis
- if metal is too reactive to be reduced by carbon or react with carbon, then electrolysis can be used to extract it.
- expensive and lots of energy required to melt ore and produce electric current.
- if metal is too reactive to be reduced by carbon or react with carbon, then electrolysis can be used to extract it.
- electrolysis of aqueous solutions
- in cathode, if h+ ions and metal ions present, hydrodgen gas will be produced (if metal ions form an elemental element more reactie than hydrodgen.
- At anode, if OH- ions and halide ions (Cl-, Br-, I-) arepresent, molecules of chlorine, bromine or iodine will be formed. If no halide ions are present then the OH- ions are discharged and oxygen will be formed.
- once experiment finished can test gaseous products
- chlorine bleaches damp litmus paper, white
- hydrodgen squeaky pop with lighted splint
- oxygen relights glowing splint
- an electric current is passed through an electrolyte.
- Ions move towards electrodes where they react and the compound decomposes.
- positive ions in electrolyte move towards the cathode and gain electrones ( refuduce)
- this creates a flow of charge through the electrolyte as ions travel to the electrodes
- Negative ions in the electrolyte will move towards the anode and lose electrons ( oxidised.
- this creates a flow of charge through the electrolyte as ions travel to the electrodes
- an electric current is passed through an electrolyte.
- molten or dissolved ions
- positive ions in electrolyte move towards the cathode and gain electrones ( refuduce)
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