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CHEMICAL PREPARATIONS AND INDICATORS FOR THE ANALYTICAL PURPOSES

a) Acid base indicators

  • Bromphenol  red (yellow-violet-red)
  • 3’,3”- Dibromphenolsulfophtalein, C19H21Br2O5S,
  • Bromphenol red, water-soluble (yellow-violet-red)
  • 3’,3” Dibromphenolsulfophtalein ammonium salt
  • Bromphenol blue, pfa (yellow – blue) M.w.669,96
  • 3’, 3”, 5’, 5”- Tetrabromphenolsulfophthalein, C19H10Br4O5S
  • Bromphenol blue, water-soluble (yellow – blue)
  • 3’, 3”, 5’, 5”- Tetrabromphenolsulfophthalein ammonium salt 
  • Cresol red, pfa (yellow –пурпурно-red)
  • о- Cresolsulfophthalein C21H18O5S,  M.w. 382,44
  • Cresol red, water-soluble, pfa о- Cresolsulfophthalein ammonium salt C21H21NO5S,  M.w. 399,43
  • Methyl orange, pfa (red-yellow)
  • Lacmoid, pfa  (red-yellow) Resocrin  blue
  • Thymol  blue, pfa (red – yellow, yellow- blue),
  • Thymolsulfophthalein C27H30O5S×1/2Н2О,  M.w. 475,60
  • Thymol  blue, water-soluble, pfa (red – yellow, yellow- blue)
  • Thymolsulfophtalein ammonium salt
  • Tropaeolin O, pfa  (yellow – orange) (Acid orang 6)
  • 2’,4’- Dioxyasobensol-4-sulfoacid sodium salt
  • Phenol red, pfa  (Yellow-red)
  • Phenol red, water-soluble, pfa (Yellow-orange-intensively pink) Sodium salt

b) Analytical reagents

  • 1,5- Diphenilcarbaside, pfa (adsorption indicator)
  • M.w. 242,28; C13H14ОN4
  • p-(Dimethylamino) benzaldehyde
  • Dimethylsulphone
  • Pyrogallol A (1,2,4-Triacetoxybenzene)
  • Fisher's reagents;
  • 2,3,5-Triphenyltetrazoliumchloride
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