Organic Chemistry

In Carius method, the weighed organic compound (containing phosphorus) is heated with conc followed by in the presence of and . By this magnesium ammonium phosphate, is formed which on ignition gives magnesium pyrophosphate . From the amount of magnesium pyrophosphate, the percentage of phosphorus is calculated as of

The colour of ferric ferro cyanide is Prussian blue so it is generally called Prussian blue. Its chemical formula is .

Sulphur of organic compounds is detected by using sodium nitroprusside. With it sulphur forms a violet colour complex, called sodium thionitroprusside.