Sodium thiosulfate pentahydrate 10102-17-7


Product Deail


Sodium thiosulfate pentahydrate

Another name】Sodium hyposulfite.

Description】Colorless crystals or white particles, weathering or deliquescence. Relative density 1.69, melting point 48.45℃, 100℃ lost water of crystallization. Soluble in water, slightly soluble in alcohol. There's reduction.

Test items

GR

AR

CP

Other

Assay(Na2S2O3•5H2O) /%

≥99.5

≥99.0

≥98.5

Custom

pH(50g/L,25℃)

6.0-7.5

6.0-7.5

6.0-7.5

Clarity of solution /#

≤2

≤3

≤5

Water insoluble /%

≤0.002

≤0.005

≤0.01

Chloride(Cl) /%

≤0.02

≤0.02

Sulphates and sulfites (as SO4) /%

≤0.04

≤0.05

≤0.1

Sulfur compound(S) /%

≤0.000 1

≤0.000 25

≤0.000 5

Total nitrogen(N) /%

≤0.002

≤0.005

-

Potassium(K) /%

≤0.001

-

-

Magnesium(Mg) /%

≤0.001

≤0.001

-

Calcium(Ca) /%

≤0.003

≤0.003

≤0.005

Iron(Fe) /%

≤0.000 5

≤0.000 5

≤0.001

Heavy metals (as Pb) /%

≤0.000 5

≤0.000 5

≤0.001

Use】Mainly used for photographic industry as fixing agent; It can be used for tanning leather and extracting silver from ore. It can be used to remove chlorine from tap water and is widely used in aquaculture.