Question

Write the content of mordant black 11 and how it is to be prepared

Answer 1

Mordant Black 11 is a dye used as a metal indicator.

Explanation:

• The synonym of mordant black 11 is Eriochrome Black T. The application is that the dye is used potentially as a metal indicator. It has the molecular weight of 461.38, and CAS number, 1787-61-7. The molecular formula of C20H12N3NaO7S.  
• The appearance of mordant black 11 is powder, it's physical state is solid. It is soluble in water and can be stored at room temperature.  
• Mordant Black 11 is prepared by dissolving 2 grams of hydroxylamine hydrochloride with 0.2 grams of eriochrome black T in sufficient methanol. This produces 50 ml of mordant black. This should be prepared before using.  

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