Bromocresol Green, Sodium Salt

Other Names Phenol, 4,4 -(3H-l,2-benzoxathiol-3-ylidene)to[2,6-dil)romo-3-methyl-, S,S-diox-ide, monosodium salt 3H-l,2-Benzoxathiole, phenol deriv. 

CA Index Name Hienol, 4,4 -(2,2-dioxido-3H-l,2-benzoxathiol-3-ylidene)te[2,6-dibromo-3-melhyl-, monosodium salt 

CAS R istry Number 62625-32-5 Merck Index Number Not Usted Chemical Structure 

Chemical/Dye Class Sulfonephthalein Molecular Formula C2iHi3Br405SNa Molecular Weight 720.02 pH Range 3.8-5.4 

Physical Form Greenish-black crystalline powder Solubility Soluble in water, ethanol UV-Visible (Xmax) 617 nm, 400 nm Melting Point 230 C (decompose) 

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Bromocresol Green sodium salt [62625-32-5] yellow-blue 0.05 (in water)... 

Bromocresol green, sodium salt 4.0-5.6 Aqueous Yellow Blue... 

Bromocresol Green indicator dissolve 1 g of water soluble bro-mocresol green (sodium salt) in 100 mL of distilled water. 

In the direct method, a solution of the ammonium salt is treated with a solution of a strong base (e.g. sodium hydroxide) and the mixture distilled. Ammonia is quantitatively expelled, and is absorbed in an excess of standard acid. The excess of acid is back-titrated in the presence of methyl red (or methyl orange, methyl orange-indigo carmine, bromophenol blue, or bromocresol green). Each millilitre of 1M monoprotic acid consumed in the reaction is equivalent to 0.017032 g NH3 ... 

Procedure. The test solution should contain between 0.001 and 0.02 mg of cobalt. Evaporate almost to dryness, add 1 mL of concentrated nitric acid, and continue the evaporation just to dryness to oxidise any iron(II) which may be present. Dissolve the residue in 10 mL of water containing 0.5 mL each of 1 1 hydrochloric acid and 1 10 nitric acid. Boil for a few minutes to dissolve any solid material. Add 2.0 mL of a 0.2 per cent aqueous solution of nitroso-R-salt and also 2.0 g of hydrated sodium acetate. The pH of the solution should be close to 5.5 check with bromocresol green indicator or with a pH meter. Boil for 1 minute, add 1.0 mL of concentrated hydrochloric acid, and boil again for... 

Mixed Indicator Solution Prepare separate 0.1% solutions of bromocresol green in methanol and the sodium salt of methyl red in water. Mix 5 parts by volume of the bromocresol green solution with one part of the methyl red solution. 

Alizarin Alizarin Red S Alizarin Yellow R Benzopurpurine 4B 4,4 -Bis(2-amino-l-naphthylazo)-2,2 -stilbenedisulfonic acid 4,4 -Bis(4-amino-l-naphthylazo)-2,2 -stilbenedisulfonic acid Brilliant Yellow Bromocresol Green Bromocresol Purple Bromophenol Blue Bromothymol Blue Chlorophenol Red Clayton Yellow Congo Red o-Cresolphthalein Cresol Red Crystal Violet Curcumin (Turmaric) p-(2,4-Dihydroxyphenylazo) benzenesulfonic acid, sodium salt... 

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