Search results
Results from the WOW.Com Content Network
The only hydrates with stable melting points are NaOH·H 2 O (65.10 °C) and NaOH·3.5H 2 O (15.38 °C). The other hydrates, except the metastable ones NaOH·3H 2 O and NaOH·4H 2 O (β) can be crystallized from solutions of the proper composition, as listed above. However, solutions of NaOH can be easily supercooled by many degrees, which ...
Sodium was first isolated by Humphry Davy in 1807 by the electrolysis of sodium hydroxide. Among many other useful sodium compounds, sodium hydroxide is used in soap manufacture, and sodium chloride (edible salt) is a de-icing agent and a nutrient for animals including humans. Sodium is an essential element for all animals and some plants.
The structure of sodium oxide has been determined by X-ray crystallography.Most alkali metal oxides M 2 O (M = Li, Na, K, Rb) crystallise in the antifluorite structure.In this motif the positions of the anions and cations are reversed relative to their positions in CaF 2, with sodium ions tetrahedrally coordinated to 4 oxide ions and oxide cubically coordinated to 8 sodium ions.
Melting point: 350.1 °C (662.2 °F; 623.2 K) (anhydrous) 55 °C (dihydrate) ... It is analogous to sodium hydroxide, and is a strong base. Preparation
Melting point: 260 °C (500 °F; 533 K) Solubility in water. ... The reaction of sodium hydroxide with anhydrous ethanol suffers from incomplete conversion to the ...
It is the starting point for the chloralkali process, the industrial process to produce chlorine and sodium hydroxide, according to the chemical equation 2 NaCl + 2 H 2 O → e l e c t r o l y s i s Cl 2 + H 2 + 2 NaOH {\displaystyle {\ce {2 NaCl + 2 H2O ->[electrolysis] Cl2 + H2 + 2 NaOH}}}
At this point the solubility curve changes slope, and the solubility becomes almost independent of temperature. This temperature of 32.384 °C, corresponding to the release of crystal water and melting of the hydrated salt, serves as an accurate temperature reference for thermometer calibration. Temperature dependence of Na 2 SO 4 solubility in ...
Sodium hydroxide is a multi-million-ton per annum commodity chemical. The corresponding electrically neutral compound HO • is the hydroxyl radical. The corresponding covalently bound group –OH of atoms is the hydroxy group. Both the hydroxide ion and hydroxy group are nucleophiles and can act as catalysts in organic chemistry.