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State whether the following is true or false.
The caustic soda from a diaphragm cell contains significant sodium chloride.

  • A.True only at large scales
  • B.False only at small scales
  • C.True
  • D.False

Answer: C

Brine flows through the diaphragm, so the cell liquor carries salt that must be removed by evaporation and crystallisation. This extra step is a large part of the energy cost of the diaphragm route. Membrane caustic needs far less evaporation.

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