Difference between revisions of "GCSE Chemistry Required Practical: Electrolysis of a Solution"
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==Key Stage 4== | ==Key Stage 4== | ||
| + | {{#ev:youtube|https://www.youtube.com/watch?v=tCHE_7QeRUc}} | ||
===Meaning=== | ===Meaning=== | ||
| − | Perform an [[electrolysis]] experiment to | + | Perform an [[electrolysis]] experiment to observe what happens when an [[aqueous]] [[solution]] is [[electrolysis|electrolysed]]. |
===Method=== | ===Method=== | ||
| + | #Pour 50ml of [[Copper (II) Chloride]] [[solution]] into a 100ml [[beaker]]. | ||
| + | #Place two [[Carbon]] [[electrode]]s held apart from one another by an [[Electrical Insulator|electrical insulator]]. | ||
| + | #Attach a [[Direct Current|direct current]] [[Power Pack|power pack]] to the [[electrode]]s using wires and crocodile clips. | ||
| + | #Set the [[Potential Difference|potential difference]] to 4 [[Volt]]s. | ||
| + | #Record your [[observation]]s of changes at each [[electrode]]. You may also use a [[pH Indicator]] paper next to the [[anode]] but above the [[solution]] and note any colour change. | ||
| + | #After 5 minutes turn off the [[Power Pack|power pack]] and remove the [[cathode]] to [[observe]] whether any changes have taken place. | ||
| + | #Repeat this experiment for the following [[solution]]s; [[Copper (II) Sulphate]], [[Sodium Chloride]] and [[Sodium Sulphate]]. | ||
| + | |||
| + | ===Copper Chloride Results=== | ||
| + | : Anode: Bubbles of [[gas]] form - Placing [[litmus]] paper next to the [[anode]] bleaches the paper, showing the presence of [[Chlorine]] [[gas]]. | ||
| + | : Cathode: A pink/brown [[solid]] forms. - This is copper. | ||
| + | |||
| + | ===Copper Sulphate Results=== | ||
| + | : Anode: Bubbles of [[gas]] form - Collecting the [[gas]] in a [[Test Tube|test tube]] it relights a glowing splint, showing the presence of [[Oxygen]]. | ||
| + | : Cathode: A pink/brown [[solid]] forms - This is copper. | ||
| + | |||
| + | ===Sodium Chloride Results=== | ||
| + | : Anode: Bubbles of [[gas]] form - Placing [[litmus]] paper next to the [[anode]] bleaches the paper, showing the presence of [[Chlorine]] [[gas]]. | ||
| + | : Cathode: Bubbles of [[gas]] form - Collecting the [[gas]] in a [[Test Tube|test tube]] a lit splint causes a squeaky pop sound, showing the presence of [[Hydrogen]] [[gas]]. | ||
| + | |||
| + | ===Sodium Sulphate Results=== | ||
| + | : Anode: Bubbles of [[gas]] form - Collecting the [[gas]] in a [[Test Tube|test tube]] it relights a glowing splint, showing the presence of [[Oxygen]]. | ||
| + | : Cathode: Bubbles of [[gas]] form - Collecting the [[gas]] in a [[Test Tube|test tube]] a lit splint causes a squeaky pop sound, showing the presence of [[Hydrogen]] [[gas]]. | ||
Latest revision as of 09:36, 29 March 2020
Contents
Key Stage 4
Meaning
Perform an electrolysis experiment to observe what happens when an aqueous solution is electrolysed.
Method
- Pour 50ml of Copper (II) Chloride solution into a 100ml beaker.
- Place two Carbon electrodes held apart from one another by an electrical insulator.
- Attach a direct current power pack to the electrodes using wires and crocodile clips.
- Set the potential difference to 4 Volts.
- Record your observations of changes at each electrode. You may also use a pH Indicator paper next to the anode but above the solution and note any colour change.
- After 5 minutes turn off the power pack and remove the cathode to observe whether any changes have taken place.
- Repeat this experiment for the following solutions; Copper (II) Sulphate, Sodium Chloride and Sodium Sulphate.
Copper Chloride Results
- Anode: Bubbles of gas form - Placing litmus paper next to the anode bleaches the paper, showing the presence of Chlorine gas.
- Cathode: A pink/brown solid forms. - This is copper.
Copper Sulphate Results
- Anode: Bubbles of gas form - Collecting the gas in a test tube it relights a glowing splint, showing the presence of Oxygen.
- Cathode: A pink/brown solid forms - This is copper.
Sodium Chloride Results
- Anode: Bubbles of gas form - Placing litmus paper next to the anode bleaches the paper, showing the presence of Chlorine gas.
- Cathode: Bubbles of gas form - Collecting the gas in a test tube a lit splint causes a squeaky pop sound, showing the presence of Hydrogen gas.