Question

7 What is the role of diaphragm used in the manufacture of sodium hydroxide​

Answer 1

Answer:

Diaphragm prevents hydroxide ions entering anode compartment and prevents chloride ions entering cathode compartment. Saturated brine enters anode compartment where chlorine gas is produced. Na+ migrates across diaphragm to cathode compartment combining with OH- to form NaOH.

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Answer 2

Answer:

Diaphragm cell

Explanation:

The diaphragm prevents the reaction of the caustic soda with the chlorine. A diluted caustic brine leaves the cell. The caustic soda must usually be concentrated to 50% and the salt removed. This is done using an evaporative process with about three tonnes of steam per tonne of caustic soda.