CHAPTER 5. THE CHEMICAL INDUSTRY 5.3
ANODE
NaCl is added to
this compartment
CATHODE
(a)
(b) Cl−ions
H+ ions are re-
duced to H 2 gas
Na+ions in solu-
tion
OH−ions in solu-
tion
(c)
Na+ and OH−
ions react to form
NaOH
(a) What liquid is present in the cathode compartment at (a)?
(b) Identify the gas thatis produced at (b).
(c) Explain one featureof this cell that allows the Na+and OH−ions to react
at (c).
(d) Give a balanced equation for the reaction that takes place at (c).
- Summarise what youhave learnt about the three types of cells in thechloralkali
industry by completingthe table below:
Mercury cell Diaphragm
cell
Membrane
cell
Main raw material
Mechanism of separat-
ing Cl 2 and NaOH
Anode reaction
Cathode reaction
Purity of NaOH pro-
duced
Energy consumption
Environmental impact
