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Eriochrome black T (C.I. 14645), 100 g

1 % in NaCl, trituration
Pack Qty.
2-Hydroxy-1-(1-hydroxynaphthyl-2-azo)-6-nitronaphthalene 4-sulphonic acid monosodium salt, Mordant black 11
Empirical formula C20H12N3NaO7S
Molar mass (M) 461,38 g/mol
Melting point (mp) 800 °C
CAS No. 1787-61-7
EG-Nr. 217-250-3

Metal indicator
Trituration with NaCl (1:99), ready-to-use

€64.40/Pack Qty. 

excl. VAT. | 100 g per Pack Qty.

Art. No. K860.3

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Product details

Eriochrome black T (C.I. 14645) 1 % in NaCl, trituration

Technical Information
Determination of Ba 
rare earth metals 
Eriochrome black T (C.I. 14645)
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K860.1 50 g plastic


K860.2 25 g plastic


K860.3 100 g plastic


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Downloads / MSDS

General information

Indicators and Dyes

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

Determination of Water Hardness

Water contains a whole host of salts and other compounds in addition to the gases dissolved in it (oxygen, nitrogen, carbon dioxide). Its most important constituents are magnesium and calcium in the form of their chlorides, sulphates and bicarbonates. These dissolved salts are known as hardeners. The bicarbonates precipitate in the heat (during boiling) as carbonates and are known as carbonate hardness or temporary hardness. The sulphate and chloride compounds are known as permanent hardness or non-carbonate hardness. Total hardness describes the concentration of alkaline earth metal ions in water.

The unit of measurement for water hardness used to be 1 °dH (German degrees of hardness), which corresponds to 10,00 mg CaO or 7,19 mg MgO in one litre of water. Today we use millimoles per litre (mmol/l), whereby 1 °dH corresponds to 0,18 mmol/l of earth metal ions and 1 mmol/l corresponds to 5,6 °dH.

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:

Type analysis

Suitability as indicatorcomplies
Trituration of Eriochrome black T with NaCI p.a., 1:100 simply add to the solution that has to be titrated; 1-4 mg dye in 100 ml.