Bromophenol Blue, Sodium Salt

Other Names Phenol, 4,4 -(3H-l,2-benzoxathiol-3-ylidene)fci5[2,6-dibromo-,S,S-dioxide, monosodium salt 3H-l,2-Benzoxathiole, phenol deriv. 

CAS Registry Number 62625-28-9 Merck Index Number Not hsted Chemical Structure 

Chemical/Dye Class Sulfonephthalein Molecular Formula Ci9H9Br405SNa Molecular Weight 691.97 pH Range 3.0-4.6 

Physical Form Blue-black crystalline powder Solubility Soluble in water, ethanol UV-Visible (Xmax) 589 nm, 383 nm Melting Point 250°C Synthesis Synthetic methodsi-  

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Bromophenol blue sodium salt (water Hexadecyltrimethylammonium bromophenol ... 

Ng and Assirelli have carried out a mixing study in batch stirred vessels with working volumes of 3 L to 20L using a fiber-optic UV-vis monitoring technique. Bromophenol blue sodium salt was used as a non-reactive tracer. The results on traditional Rushton turbines and 45° angled pitched blade turbines showed good agreement with a typical conductivity technique and a correlation proposed in literature. 

Bromophenol Blue sodium salt [34725-61-6] green-yellow- blue-violet 0.05 (in water)... 

Bromophenol blue, sodium salt 6.2-7.6 Aqueous Yellow Blue... 

The mixture is allowed to stand at room temperature overnight, the crystals filtered off and washed on a filter with acetone. The product Is obtained as colorless needles, which melt at 111° to 112.5°C. The methylsulfate is not stable indefinitely. For preparation of pure chloride salt it is desirable to use methylsulfate which gives no titratable acidity with sodium hydroxide using bromophenol blue as indicator. 

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 ... 

Eq. (a) shows that the quaternary salt gets quantitatively precipitated by sodium tetraphenyl boron as the complexing agent. Eq. (b) depicts that quaternary compounds shall readily react with certain anionic dye, such as bromophenol blue, to yield a blue, chloroform-soluble complex. 

Methyl red Methyl red sodium salt Chlorophenol red Hematoxylin Litmus extra pure Bromophenol red Bromocresol purple 4-Nitrophenol Bromoxylenol blue Alizarin 4.4 t- V ... 

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... 

Prepare 0.1 M sodium carbonate using the purest anhydrous salt. Pipette 25.0 cm in a conical flask, add a few drops of thymol blue indicator. Cool to 0 C and stir magnetically as you titrate with standardised 0.2 M HCl until the colour changes from yellow to blue. Repeat and calculate the average titre. Repeat two titrations using bromophenol blue as indicator when the colour changes at the end-point from blue to yellow. Compare the two titres with the different indicators. 

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