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Sodium thiosulphate pentahydrate, 1 kg

≥99,5 %, p.a., ACS
Pack Qty.
Empirical formula Na2S2O3 · 5 H2O
Molar mass (M) 248,18 g/mol
Density (D) 1,73 g/cm³
Melting point (mp) 48 °C
CAS No. [10102-17-7]
EG-Nr. 231-867-5

Photographic fixer; for volumetric solutions in iodometry; for detection of hydrocyanic acid, quinine, chlorate hydrate and cobalt.

€41.85/Pack Qty. 

excl. VAT. | 1 kg per Pack Qty.

Art. No. P034.2

In production
from 6 Pack Qty. €39.76/Pack Qty.
from 24 Pack Qty. €37.66/Pack Qty.
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Sodium thiosulphate pentahydrate
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P034.1 500 g plastic


P034.2 1 kg plastic


P034.3 2.5 kg plastic


P034.5 25 kg plastic


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Downloads / MSDS

General information

Determination of biological oxygen demand (BOD)

BOD (biochemical oxygen demand) is a measure of the amount of oxygen that microorganisms need to break down the organic material in a water sample over a specific period of time. It is important to calculate the oxygen concentration at the start and end of the measuring time, which is usually five days and is expressed as an index (BOD5). Chemical, electrochemical or physical methods are used for this calculation.

Indicators and Dyes

Carl ROTH offers many indicators and dyes of high purity, which can be used in special applications.

Salts for Analysis

Our salts for analysis are manufactured under strict production guidelines. Analytical purity and best quality reliably characterize each batch. Salts in p.a. quality made by Carl ROTH meet the high requirements for reproducible results. Most of our salts are additionally specified according to international standards like ACS and ISO.

p.a.: pro analysi (for analysis)ACS: American Chemical SocietyISO: International Standard Organisation

Certificates of Analysis

You can search for and download your certificate of analysis for the selected product here. Please provide your batch number.
The following analysis certificates have been found:

Guarantee analysis

Assay (iodom.)99,5-101,0 %
pH value (5 % in water)6,0-8,4
In H2O insoluble matter≤0,005 %
Total nitrogen (as N)≤0,002 %
Chloride (Cl)≤0,02 %
Sulphate and sulphite (as SO4)≤0,1 %
Sulphide (S)≤0,0001 %
Heavy metals (as Pb)≤0,0005 %
Calcium (Ca)≤0,002 %
Cobalt (Co)≤0,0005 %
Chromium (Cr)≤0,0005 %
Magnesium (Mg)≤0,001 %
Nickel (Ni)≤0,0005 %
Potassium (K)≤0,005 %
Cadmium (Cd)≤0,0005 %
Copper (Cu)≤0,0005 %
Iron (Fe)≤0,0005 %
Manganese (Mn)≤0,0005 %
Lead (Pb)≤0,0005 %
Zinc (Zn)≤0,0005 %