Electrolysis Of Lead Bromide And Brine 5e6l4v

Q1 Why does solid Copper chloride not conduct electricity? Q2 Why does it conduct electricity when dissolved in water? Q3 How else could you make copper chloride conduct electricity? Q4 What are the correct names for the positive and negative electrodes?

Q5 In the experiment above what gas is being produced that can bleach damp litmus paper? Q6 Which electrode is it being produced from?

GROUP ACTIVITY: Practising half equations • Write the half equation to show the reaction at the cathode during the electrolysis of      a) Copper Chloride     b) Lead Bromide (lead has a valency of +2)     c) Sodium Chloride     d) Aluminum Bromide • Write the half equation to show the reaction at the anode during the electrolysis of     a) Copper Chloride     b) Lead Bromide     c) Sodium Oxide

Electrolysis of molten lead bromide • Pb2+  +  2e-       Pb (lead metal at the (-)cathode). 2Br-  -  2e-       Br2 (bromine gas at the (+)anode). • Lead ions gain electrons (reduction) to form lead atoms. • Bromide ions lose electrons (oxidation) to form bromine atoms. • The bromine atoms combine to form molecules of bromine gas. • The overall reaction is PbBr2(l)           Pb(s)  +   Br2(g)

Electrolysis of brine – NaCl (aq)

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Electrolysis of brine • Hydrogen is produced at the cathode • Chlorine is produced at the anode • The solution remaining is sodium hydroxide

Electrolysis of brine • Hydrogen is produced at the cathode • Chlorine is produced at the anode • The solution remaining is sodium hydroxide Copy please!

Cathy’s Ankles (CatHy’s AnCl)

Electrolysis of brine • Cathode (-) 2H+(aq) + 2e- H2(g) SODIUM IS NOT FORMED

The sodium ion is more stable in water H2O H+ + OH• Anode (+) 2Cl-(aq) – 2e- Cl2(g)

If the metal ion is ABOVE hydrogen in the reactivity series then HYDROGEN gas is ALWAYS given off at the cathode If the metal ion is BELOW hydrogen in the reactivity series then that METAL be collected than thewill hydrogen ion at the cathode

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Chemicals from salt

1413° C

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Copy and complete the table below for the following aqueous solutions

Solution Potassium iodide Copper bromide Calcium oxide Silver iodide Lead iodide

Product at cathode

Product at anode

Copy and complete the table below for the following aqueous solutions

Solution Potassium iodide

Product at cathode

Product at anode

Hydrogen

Iodine

Copper bromide

Copper

Bromine

Calcium oxide

Hydrogen

Oxygen

Silver

Iodine

Lead

Iodine

Silver iodide Lead iodide

Now complete your electrolysis review sheet!

Stand up sit down 1. One person names a topic. 2. All pupils write a key word to do with the topic on a piece of paper 3. The person who chose the topic has 30 seconds to name as many key words to do with the topic as they can. 4. If the word the pupil has written down is said they have to sit down. 5. The aim for the topic chooser is to get everyone to sit down. 6. The aim for the pupils writing down a word is to out fox the topic chooser with a relevant but obscure word.