Ammonium thiosulphate | back |
1. Chemical name:Ammonium Thiosulphate
2. Structural formula:(NH4)2S2O3
3. Molecular formula:
2. Structural formula:(NH4)2S2O3
3. Molecular formula:
4. CAS NUMBER: 7783-18-8
5. Molecular weight:148.20
5. Properties:. Colorless transparent liquid or white crystal. Relative density of crystal: 1.679,easily soluble in water,insoluble in alcohol, ether,slightly soluble in acetone.
7. Quality standard:
5. Molecular weight:148.20
5. Properties:. Colorless transparent liquid or white crystal. Relative density of crystal: 1.679,easily soluble in water,insoluble in alcohol, ether,slightly soluble in acetone.
7. Quality standard:
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Index name
|
Liquid
|
Solid
|
|
Assay
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56~60%
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≥98%
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|
Appearance
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colorless transparent Liquid
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white crystal
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|
Ammonium sulfite
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≤1.0%
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≤1.0%
|
|
Alkalinity
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0.3~1.5%
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≤0.4%
|
|
Insoluble matter ( precipitation of Ca and Mg)
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≤0.2%
|
---
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|
Heavy metals(as Pb)
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≤0.001%
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≤0.002%
|
|
Fe
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≤0.00025%
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≤0.001%
|
|
Sulfide(as s)
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≤0.0002%
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≤0.0002%
|
|
Ignition residual
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≤0.1%
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≤0. 2%
|
|
Specific gravity
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1.310~1.335
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9.Uses: Used as fixer for takingPhotographic s,key component of silvering electrobath, shielding effect agent, casting protectant of Al-Mg alloy, bactericide and analytical reagent.
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