Note 71 — Chapter I · ON WATER AND ITS COMPOUNDS
George Kamensky translation
In combining with water one part by weight of lime evolves 245 units of heat. A high temperature is obtained, because the specific heat of the resulting product is small. Sodium oxide, Na2O, in reacting on water, H2O, and forming caustic soda (sodium hydroxide), NaHO, evolves 552 units of heat for each part by weight of sodium oxide.