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Sea water mainly comprising of NaCl is separated and formed into a concentrated solution of NaCl called 'Brine'. Than in a diaphragm cell you add the NaCl (conc) and use Titanium Anode and Steel Cathode. At Anode Cl2 gas is released and Cathode H2 gas is released and the remaining solution is NaOH which is filtered out.

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Q: How can you make NaOH from sea water and what are the reactions?
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