Obtain samples, say 50ml, add 10ml ammonia and solochrome black indicator, and titrate with c . 0.01M EDTA . n ( EDTA ) will equal n ( Ca ) [ a reasonable indicator of hardness ].
2.
Synonyms for the dye include " Acid chrome black ET; cacid chrome black ETN; chrome black PB; mordant black 11, monosodium salt; eriochrom black T; solochrome black T; solochrome black T; sunchromine black ET; superchrome black TS . " " Eriochrome is a registered trademark of Ciba Specialty Chemicals Corp " but I'm not finding anything from them directly online.
3.
Synonyms for the dye include " Acid chrome black ET; cacid chrome black ETN; chrome black PB; mordant black 11, monosodium salt; eriochrom black T; solochrome black T; solochrome black T; sunchromine black ET; superchrome black TS . " " Eriochrome is a registered trademark of Ciba Specialty Chemicals Corp " but I'm not finding anything from them directly online.
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