What is he IUPAC name of the structural formula CH2Br2?
This compound is dibromomethane.
Common names in formulae are the IUPAC names given to all substances so that people who speak different languages can be able to tell the formula. For example if someone said to measure 100mls of oil of vitriol, most people wouldn't know what it was but to give it it's IUPAC name of sulphuric acid, everyone would be able to do the instruction.
Eriochrome Black T This is a blue complexometric indicator that turns to red upon the formation of a metal-complex in complexometric titrations. Structural formula: can be found as 'Related link' just right down this answer page. Formula: C20H12N3O7SNa (or HOC10H6N=NC10H4(OH)(NO2)SO3Na) IUPAC name: sodium (4Z)-4-[(1-hydroxynaphthalen-2-yl-hydrazinylidene]-7-nitro-3-oxo-Y-naphthalene-1-sulfonate