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Why membrane cell required more concentrated brine solution then the diaphragm cell for the production of sodium hydroxide?
Accepted Answer
In the diaphragm cell, the current passing through the cell causes the migration of hydroxide ions from the cathode to the anode compartment, where they combine with sodium ions to form sodium hydroxide and hydrogen gas. The brine solution in the diaphragm cell serves to provide a source of sodium ions and to increase the conductivity of the solution. In the membrane cell, on the other hand, the current passing through the cell causes the migration of sodium ions from the anode to the cathode compartment, where they combine with hydroxide ions to form sodium hydroxide. The brine solution in the membrane cell serves to provide a source of sodium ions, but it also helps to prevent the migration of hydroxide ions from the cathode to the anode compartment. This prevents the formation of hydrogen gas and allows for the production of a more concentrated sodium hydroxide solution.
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