Qidong A&P Pharmaceutical Co., Ltd.--Potassium sulfite solution|10117-38-1

启东亚太药业有限公司

Qidong A&P Pharmaceutical Co., Ltd.

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Potassium sulfite solution

CAS No ：10117-38-1
Molecular formula: K₂SO₃
Molecular weight: 158.26
Physical and chemical properties: colorless transparent, with reducing properties. The solution is weakly alkaline. It is unstable in the air.
Usage: It can be used as a developing agent for the photosensitive industry or as a protective agent for the fixing solution. It is also used as a reducing agent in the printing and dyeing industry, as a bleaching agent for wool and silk.
Packing: 270kg plastic drum
Specification Standard: Q/G320GAI07-2021

Structural Formula:

Specifications:

Item	Index
Appearance	Colorless transparent liquid
Content（W/W）%	44.5-46.0
Color (black unit)≤	40
Heavy metals（Pb）%≤	--
Iron(Fe) （以Fe计）% ≤	0.001
Sulphate ≤%	0.7
Insoluble matter (precipitation of calcium and magnesium) ≤%	0.2
Insoluble matter ≤%	0.005
Specific gravity（20℃）	1.436-1.460
Reaction with silver nitrate ammonia solution	qualified
Density（20℃）	1.437-1.457
pH（25℃ Stock solution）	9.0-9.5
Thiosulfate（S2O32）% ≤	0.006

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