Sodium Aluminum Sulphate

Sodium Aluminum Sulphate
Sodium Aluminum Sulphate
Are common
Systematic ; name	Sodium Aluminum Sulphate
Traditional names	Aluminum Sulphate; aluminum sodium alum ; sodium aluminum alum
Chem. formula	NaAl (SO 4 ) 2
Physical properties
Molar mass	242.10; ; hydrate 458.28 g / mol
Density	hydrate 1,325 g / cm³
Thermal properties
T. melt.	hydrate 61 ° C
Chemical properties
Water solubility	37.44 0 ; 39.72 20 ; 44.0 40 g / 100 ml
Classification
Reg. CAS number	10102-71-3
Pubchem
Reg. EINECS number
SMILES
Inchi
Codex Alimentarius

Sodium aluminum sulfate is an inorganic compound, a mixed salt of aluminum , sodium and sulfuric acid with the formula NaAl (SO ₄ ) ₂ , white hygroscopic crystals, well soluble in water, forms a crystalline hydrate , alumi sodium .

Content

Getting

In nature, the mineral solphate is found - NaAl (SO ₄ ) ₂ · 12H ₂ O.

Co-crystallization of sodium and aluminum sulphates:

{\mathsf {Na_{2}SO_{4}+Al_{2}(SO_{4})_{3}+24H_{2}O\ {\xrightarrow {\ }}\ 2NaAl(SO_{4})_{2}\cdot 12H_{2}O}}

{\ displaystyle {\ mathsf {Na_ {2} SO_ {4} + Al_ {2} (SO_ {4}) _ {3} + 24H_ {2} O \ {\ xrightarrow {\}} \ 2NaAl (SO_ {4 }) _ {2} \ cdot 12H_ {2} O}}}

Physical Properties

Sodium aluminum sulphate is a white, hygroscopic white crystals, well soluble in water.

It is isolated from aqueous solutions as NaAl (SO ₄ ) ₂ · 12H ₂ O crystalline hydrate — colorless cubic crystals, space group P a 3, cell parameters a = 1.221 nm with a melting point of 61 ° C (in its own water of crystallization).

Chemical Properties

Decomposed by strong heating:

{\mathsf {4NaAl(SO_{4})_{2}\ {\xrightarrow {800^{o}C}}\ 2Na_{2}SO_{4}+2Al_{2}O_{3}+6SO_{2}+3O_{2}}}

{\ displaystyle {\ mathsf {4NaAl (SO_ {4}) _ {2} \ {\ xrightarrow {800 ^ {o} C}} \ 2Na_ {2} SO_ {4} + 2Al_ {2} O_ {3} + 6SO_ {2} + 3O_ {2}}}}

Aqueous solutions are acidic due to hydrolysis of the aluminum cation :

{\mathsf {[Al(H_{2}O)_{6}]^{3+}+H_{2}O\ \rightleftarrows \ [Al(H_{2}O)_{5}(OH)]^{2+}+H_{3}O^{+}}}

{\ displaystyle {\ mathsf {[Al (H_ {2} O) _ {6}] ^ {3 +} + H_ {2} O \ \ rightleftarrows \ [Al (H_ {2} O) _ {5} ( OH)] ^ {2 +} + H_ {3} O ^ {+}}}}

Application

Food supplement E521.
It is used for clarification and bleaching of water.
Preservative for vegetables, fruits and fish meat.
Used as a hemostatic and cauterizing agent in medicine.
Mordant in dyeing fabrics, paper sizing, tanning leather.

Literature

Chemical Encyclopedia / Redkol .: Knunyants I.L. et al. - M .: Soviet Encyclopedia, 1990. - T. 2. - 671 p. - ISBN 5-82270-035-5 .
Chemist Handbook / Redkol .: Nikolsky B.P. et al. - 2nd ed., Rev. - M.-L.: Chemistry, 1966. - T. 1. - 1072 p.
Chemist Handbook / Redkol .: Nikolsky B.P. et al. - 3rd ed., Rev. - L .: Chemistry, 1971. - T. 2. - 1168 p.

Sodium Aluminum Sulphate
Are common
Systematic name	Sodium Aluminum Sulphate
Traditional names	Aluminum Sulphate; aluminum sodium alum ; sodium aluminum alum
Chem. formula	NaAl (SO ₄ ) ₂
Physical properties
Molar mass	242.10; hydrate 458.28 g / mol
Density	hydrate 1,325 g / cm³
Thermal properties
T. melt.	hydrate 61 ° C
Chemical properties
Water solubility	37.44 ⁰ ; 39.72 ²⁰ ; 44.0 ⁴⁰ g / 100 ml
Classification
Reg. CAS number	10102-71-3
Pubchem
Reg. EINECS number
SMILES
Inchi
Codex Alimentarius