In examples, sodium cyanate is reacted with p-xylylene dichloride in the presence of potassium bromide, sodium bromide and potassium iodide, the solvent being N,N-dimethyl formamide. The polyisocyanates may be used to prepare ... PA Argabright,VJ Sinkey,BL Phillips - US 被引量: 3发表: ...
It is produced on a large scale by direct reaction of bromine with excess fluorine at temperatures higher than 150 °C, and on a small scale by the fluorination of potassium bromide at 25 °C. It also reacts violently with water and is a very strong fluorinating agent, although chlorine ...
NaBr, produces brown fumes and an acidic gas that decolourises acidified potassium manganate(VII)solution.This acidic gas is a significant contributor to acid rain.Write the equation for the reaction of concentrated sulfuric acid with sodium bromide.[2](d)An aqueous solution, Z, contains a mixt...
An indirect spectrophotometric method for the microdetermination of iodine or bromine in organic compounds is described. The method is based on an oxygen flask combustion yielding iodide or bromide, which is then reacted with an excess of potassium iodate or potassium bromate in acidic medium. The...
Details of pipette A, reference mark B and C, stopcocks of 1-mm bore Rubber stopper fitted with capillary tube ( b ) . REAGENTS- Potassium bromate-0.8 N , standardised against sodium thiosulphate. Sodium thiosulphate-0.1 N. Potassium bromide-A 20 per cent. w/v solution. Potassium iodide-...
Bromine : iodine.-Water-soluble colloidal forms of iodine and bromine are obtained by causing the halogen to react with gallic or tannic acid to produce hydrogen halide, converting this into an insoluble metallic halide, and decomposing this to yield the halogen in a colloidal and probably ...