|
Physical and Chemical Properties
|
Physical State
|
White crystals or
powder
|
Melting Point
|
43 °C
|
Specific Gravity
|
1.667
|
Solubility in Water
|
Soluble (33%)
|
PH
|
6.5-8
|
NFPA Ratings
|
Health: 2;
Flammability: 0; Reactivity:0
|
Stability
|
Stable under
ordinary conditions. Hygroscopic.
|
|
|
|
Applications
|
|
Sodium
Thiosulfate is a white translucent crystals or powder that is common as
the pentahydrate form; melting at 48 C; readily soluble in water and oil
of turpentine; aqueous solution is slightly alkaline which decompose to
sulfate and sulfide in the air. It is a moderate reducing agent. It is a
source of thiosulfate ion (S2O3-2) (dissolves silver
salts). Its major use is as a fixing agent in photography for developing
film and the extracting silver from ore. It is used in chrome-tanning
leather and in chemical manufacture as a source of sulfide ion. It is
also used in paper, textile, and water treatment industry and gas
purification.
|
|
Sales Specification
|
Sodium Thiosulfate Pentahydrate Photographic Grade
|
|
Appearance:
|
Monoclinic
system crystal, colorless transparent body
|
|
Sodium
thiosulfate:
|
99.0%
Min
|
|
Insoluble
substance in water:
|
0.01%
Max
|
|
Sulfuret
(As S):
|
0.001%
Max
|
|
Ferrum
(As Fe):
|
0.001%
Max
|
|
Aqueous
solution reaction:
|
In
accordance with test
|
|
Granularity:
|
12-16
|
|
|
|
|
