From Wikipedia, the free encyclopedia
Sodium pyrosulfate
[1]
|
Names
|
IUPAC name
Disodium disulfate
|
Other names
Sodium pyrosulphate; Disulfuric acid disodium salt, disodium disulfate; Sodium metabisulfate
|
Identifiers
|
|
|
|
|
ChEMBL
|
|
ChemSpider
|
|
ECHA InfoCard
|
100.034.190
|
EC Number
|
|
|
|
|
|
InChI=1S/2Na.H2O7S2/c;;1-8(2,3)7-9(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2*+1;/p-2
Key: JXAZAUKOWVKTLO-UHFFFAOYSA-L
|
[Na+].[Na+].[O-]S(=O)(=O)OS(=O)(=O)[O-]
|
Properties
|
|
Na
2
S
2
O
7
|
Molar mass
|
222.12 g/mol
|
Appearance
|
Translucent white crystals
|
Density
|
2.658 g/cm
3
|
Melting point
|
400.9 °C (753.6 °F; 674.0 K)
|
Boiling point
|
decomposes at 460 °C (860 °F; 733 K)
|
|
hydrolyses
[2]
|
Except where otherwise noted, data are given for materials in their
standard state
(at 25 °C [77 °F], 100 kPa).
|
Chemical compound
Sodium pyrosulfate
is an
inorganic compound
with the
chemical formula
of Na
2
S
2
O
7
.
[1]
It is a colorless salt.
[3]
It hydrolyses in water to form sodium bisulfate with a chemical formula of NaHSO4 which has a pH of around 1.
Preparation
[
edit
]
Sodium pyrosulfate is obtained by the
dehydration
of
sodium bisulfate
:
[4]
[5]
- 2 NaHSO
4
→ Na
2
S
2
O
7
+ H
2
O
Temperatures above 460 °C further
decompose
the compound, producing
sodium sulfate
and
sulfur trioxide
:
- Na
2
S
2
O
7
→ Na
2
SO
4
+ SO
3
Applications
[
edit
]
Sodium pyrosulfate was used in
analytical chemistry
. Samples are
fused
with sodium pyrosulfate to ensure complete dissolution before a
quantitative analysis
.
[6]
[7]
See also
[
edit
]
References
[
edit
]
- ^
a
b
Olsen, J. C., ed. (1934).
Van Nostrand's Chemical Annual
. London: Chapman and Hall.
- ^
Heinz K. Hofmeister; John R. Van Wazer (1962). "Hydrolysis of Sodium Pyrosulfate".
Inorganic Chemistry
.
1
(4). ACS: 811?812.
doi
:
10.1021/ic50004a019
.
- ^
Helmold Plessen (2000). "Sodium Sulfates".
Ullmann's Encyclopedia of Industrial Chemistry
. Weinheim: Wiley-VCH.
doi
:
10.1002/14356007.a24_355
.
ISBN
978-3527306732
.
- ^
Noyes, William (1913).
A Textbook of Chemistry
. New York: Henry Holt and Company. p.
186
. Retrieved
13 January
2016
.
- ^
von Plessen, Helmold (2000). "Sodium Sulfates".
Ullmann's Encyclopedia of Industrial Chemistry
.
doi
:
10.1002/14356007.a24_355
.
ISBN
9783527303854
.
- ^
Nemodruk, Aleksandr; Karalova, Zinaida (1969).
Analytical chemistry of boron: Analytical chemistry of the elements
. Charlottesville, VA: Ann Arbor-Humphrey Science Publishers. pp. 23 & 193.
ISBN
9780250399192
.
- ^
Kiely, P. V.; Jackson, M. L. (1965). "Quartz, Feldspar, and Mica Determination for Soils by Sodium Pyrosulfate Fusion".
Soil Science Society of America Journal
.
29
(2): 159?163.
Bibcode
:
1965SSASJ..29..159K
.
doi
:
10.2136/sssaj1965.03615995002900020015x
.
|
---|
Inorganic
| Halides
| |
---|
Chalcogenides
| |
---|
Pnictogenides
| |
---|
Oxyhalides
| |
---|
Oxychalcogenides
| |
---|
Oxypnictogenides
| |
---|
Others
| |
---|
|
---|
Organic
| |
---|