Membrane Cell Flashcards
1
Q
What is the MAIN difference between a membrane cell and a diaphragm cell?
A
The diaphragm is replaced by an ion-selective membrane. This membrane only allows positive ions to pass between compartments, negating the need for a pressure gradient. The result is to increase the purity of the NaOH produced significantly.
2
Q
The processes at the anode and cathode are ___ to the diaphragm cell.
A
identical
3
Q
What does the ion-selective membrane do? (2)
A
- Cl- ions cannot travel into the cathode compartment and contaminate the NaOH.
- OH- ions cannot travel into the anode compartment and be oxidised to form O2.
4
Q
This is the most ____ cell to use in the chlor-alkali industry and the one most widely used at present.
A
efficient
5
Q
What is the function of the +NaCl compartment?
A
Keep NaCl concentration high.
