What is the word equation for electrolysis of lead bromide?
Pb2+ + 2e- -> Pb 2Br- -> Br2 + 2e- Lead ions undergo reduction (gain of electrons) at the negative electrode to form solid lead. Bromide ions undergo oxidation (loss of electrons) at the positive electrode to form bromine gas.
Which gas is produced during the electrolysis of molten lead bromide?
The half-equations for the electrolysis of lead(II) bromide. This is a reduction reaction because the lead ions gain electrons. The negative bromide ions are attracted to the positive anode electrode and discharged to form bromine vapour.
Why does lead bromide have to be molten for electrolysis?
Electrolysis is not possible with solid lead(II) bromide. This is because the ions are held in a three-dimensional lattice, unable to move freely to the electrodes. Melting enables the ions to become mobile and to travel to the respective electrodes.
What happens when molten lead bromide is electrolysed using graphite electrodes?
At the anode, when molten lead bromide is electrolyzed using graphite electrodes. Brown fumes of bromine gas are observed at the anode.
What happens to lead bromide during electrolysis?
For example, if electricity is passed through molten lead bromide, the lead bromide is broken down to form lead and bromine. Positively charged ions move to the negative electrode during electrolysis. Negatively charged ions move to the positive electrode during electrolysis.
What is electrolysis used for?
Electrolysis is used extensively in metallurgical processes, such as in extraction (electrowinning) or purification (electrorefining) of metals from ores or compounds and in deposition of metals from solution (electroplating).
What happens during electrolysis of lead bromide?
Molten lead bromide, PbBr 2(l), is an electrolyte. During electrolysis: Pb 2+ ions gain electrons at the cathode and become Pb atoms. Br – ions lose electrons at the anode and become Br atoms, which pair up to form Br 2 molecules.
What does electrolysis produce?
Electrolysis is the process of using electricity to split water into hydrogen and oxygen.
What is the positive electrode called in electrolysis?
the anode
Positively charged ions move to the negative electrode, and negatively charged ions move to the positive electrode. The negative electrode is called the cathode and the positive electrode is called the anode. Ions are discharged at the electrodes producing elements. This process is called electrolysis.
What happens when lead bromide is Electrolysed?
What are products of electrolysis when molten lead bromide is Electrolysed?
What happens at the anode during electrolysis?
The anode is the positive electrode so attracts negative ions. At the anode, negative ions lose electrons (they are oxidised). The resulting product depends on the ionic substance but is non-metal and is often a gas.