Note 31 — Chapter XII · SODIUM
George Kamensky translation
The molecular quantity of sodium hydroxide (40 grams), on being dissolved in a large mass (200 gram molecules) of water, develops, according to Berthelot 9,780, and according to Thomsen 9,940, heat-units, but at 100° about 13,000 (Berthelot). Solutions of NaHO + nH2O, on being mixed with water, evolve heat if they contain less than 6H2O, but if more they absorb beat.