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langfang tianke biotechnology
professional production base of general chemical reagent and pharmaceutical accessories
hotline: 86-15076659665
products
products
sodium thiosulfate

molecular formula: na2s2o3·5h2o
molecular weight: 248.18
properties: colorless crystal or white particle, no odor. weathering in the dry air. soluble in water and insoluble in ethyl alcohol. density is 1.729. it loses water of crystallization at 100℃.
uses: as analytical reagent such as oxidation-reduction titration agent and reducing agent. as mordant and fixing agent.
standard:

specifications/item

ar

cp

assay(na2s2o3·5h2o)/%

≥99.0

≥98.5

ph value (50g/l solution,25℃)

6.0~7.5

6.0~7.5

clarity test

qualified

qualified

water insoluble matter/%

≤0.005

≤0.01

chloride(cl) /%

≤0.02

sulfate and sulfite(so4) /%

≤0.05

≤0.1

sulfide(s) /%

≤0.000 25

≤0.000 5

total nitrogen(n) /%

≤0.005

magnesium (mg) /%

≤0.001

calcium (ca) /%

≤0.003

≤0.005

iron (fe) /%

≤0.000 5

≤0.001

heavy metal (pb) /%

≤0.000 5

≤0.001

packing: plastic woven bag lined with plastic bag, kraft bag, carton or fiber drum, net weight is 25kg.

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langfang tianke biotechnology co., ltd.
add: sanghang industrial park, dacheng county,
hebei, china
tel: 86-15076659665 manager ma
fax: 86-316-5569332 
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