white powder (sometimes light-yellowish) hygroscopic/ when dissolved in water a colloidal black solution is formed
Odor
odorless
Density
1.5 g/cm3
Melting point
1,650 °C (3,000 °F; 1,920 K)
Solubility in water
highly soluble
Solubility
Insoluble in alcohol[2]
Refractive index (nD)
1.566
Structure
Crystal structure
orthorhombic
Thermochemistry
Heat capacity (C)
73.6 J/mol K
Std molar entropy (S⦵298)
70.4 J/mol K
Std enthalpy of formation (ΔfH⦵298)
-1133.2 kJ/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
Chemical compound
Sodium aluminate is an inorganic chemical that is used as an effective source of aluminium hydroxide for many industrial and technical applications. Pure sodium aluminate (anhydrous) is a white crystalline solid having a formula variously given as NaAlO2, NaAl(OH)4 (hydrated),[3] Na2O·Al2O3, or Na2Al2O4. Commercial sodium aluminate is available as a solution or a solid.
Other related compounds, sometimes called sodium aluminate, prepared by reaction of Na2O and Al2O3 are Na5AlO4 which contains discrete AlO45− anions, Na7Al3O8 and Na17Al5O16 which contain complex polymeric anions, and NaAl11O17, once mistakenly believed to be β-alumina, a phase of aluminium oxide.[4][5]
^Kaduk, James A.; Pei, Shiyou (1995). "The Crystal Structure of Hydrated Sodium Aluminate, NaAlO2•5/4H2O, and Its Dehydration Product". Journal of Solid State Chemistry. 115 (1): 126–139. doi:10.1006/jssc.1995.1111.
^The Merck Index. 10th ed. Rahway, New Jersey: Merck Co., Inc., 1983., p. 1229
^"Aluminium". chemguide.co.uk.
^"Identification and characterisation of three novel compounds in the sodium–aluminium–oxygen system", Marten G. Barker, Paul G. Gadd and Michael J. Begley, J. Chem. Soc., Dalton Trans., 1984, 1139–1146, doi:10.1039/DT9840001139
^Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier ISBN 0-12-352651-5
Sodiumaluminate is an inorganic chemical that is used as an effective source of aluminium hydroxide for many industrial and technical applications. Pure...
In chemistry, an aluminate is a compound containing an oxyanion of aluminium, such as sodiumaluminate. In the naming of inorganic compounds, it is a...
hydrogen atoms. The reaction thus produces hydrogen gas and sodiumaluminate. In this reaction, sodium hydroxide acts as an agent to make the solution alkaline...
solution is added, which dissolves the sodiumaluminate, leaving the impurities as a solid residue. The amount of sodium hydroxide solution needed depends...
a sodium hydroxide solution (caustic soda) at a temperature of 150 to 200 °C. At these temperatures, the aluminium is dissolved as sodiumaluminate (primarily...
referred to as sodium borate, tincal (/ˈtɪŋkəl/) and tincar (/ˈtɪŋkər/)) is a salt (ionic compound), a hydrated or anhydrous borate of sodium, with the chemical...
chemical pulping include the Kraft process, which uses caustic soda and sodium sulfide and is the most common; alternatively, the use of sulfurous acid...
number of aluminium acetates and can be prepared in a reaction of sodiumaluminate (NaAlO2) with acetic acid. Aluminium diacetate is used as an antiseptic...
salt sodium aluminium silicate aluminum sodium silicate sodium silico aluminate sasil The formation of sodium aluminosilicate makes the Bayer process...
manufactured by a variety of related pathways. One route entails combining sodiumaluminate and hydrofluoric acid: Na3Al(OH)6 + 6 HF → Na3AlF6 + 6 H2O Other routes...
evolution of hydrogen, and in aqueous sodium hydroxide or potassium hydroxide at room temperature to form aluminates—protective passivation under these conditions...
aluminium hydroxide is precipitated from the remaining solution of sodiumaluminate. This aluminium hydroxide can be converted to aluminium oxide or alumina...
Tricalcium aluminate Ca3Al2O6, often formulated as 3CaO·Al2O3 to highlight the proportions of the oxides from which it is made, is the most basic of the...
a sodium hydroxide solution at a temperature of 150 to 200 °C (300 to 390 °F). At these temperatures, the aluminium is dissolved as sodiumaluminate (the...
Al2O3 + 6 HF → 2 AlF3 + 3 H2O Al2O3 + 2 NaOH + 3 H2O → 2 NaAl(OH)4 (sodiumaluminate) The most common form of crystalline aluminium oxide is known as corundum...
particularly high temperatures. Typically aqueous solutions of sodium silicate and sodiumaluminate are combined at 80 °C. The solvent-impregnated product is...
Na[Al(OH)4] + 3 H2 The formation of sodiumaluminate (Na[Al(OH)4]) requires that solutions of high concentration of sodium hydroxide be used to avoid the formation...
Lithium aluminate (LiAlO 2), also called lithium aluminium oxide, is an inorganic chemical compound, an aluminate of lithium. In microelectronics, lithium...
iron(III) chloride (ferric chloride) polyacrylamide polyDADMAC sodiumaluminatesodium silicate The following natural products are used as flocculants:...
solutions of alumina and silica with sodium hydroxide. Equivalent reagents include sodiumaluminate and sodium silicate. Further variations include the...
Molten sodium tetrachloroaluminate is used as an electrolyte in sodium-nickel chloride batteries. SodiumaluminateSodium hexafluoroaluminate Sodium tetrafluoroborate...
the bauxite (the residue) is removed, giving rise to a solution of sodiumaluminate, which is then seeded with an aluminium hydroxide crystal and allowed...
improved process using a combination of aluminium chloride and sodiumaluminate with sodium acetate prepared in situ has been patented: 29 NaAlO 2 + ...
are other zeolites, from alumina sources such as sodiumaluminate and silica sources such as sodium silicate. Other aluminosilicates such as kaolin are...
leaching vessel, in combination with a sodium hydroxide leachant the process resulted in a very pure sodiumaluminate solution that could be used for his...
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