The filtrate was precipitated in six fractions by lead acetate.
Simple precipitation by lead acetate solution and filtration does not answer, because all of the uric acid is not thus removed.
Very little dissolved in alcohol of this strength, but on addition of lead acetate in 50 per cent.
It can, however, be precipitated by copper acetate (Iwanoff) and by lead acetate (Young).
They are immersed alternately in lead acetate and in sulphuric acid solutions until precipitation is sufficient.
To the filtrate was added an excess of a solution of lead acetate in 50 per cent.
It was filtered off, washed free from lead acetate, decomposed by hydrogen sulphide, and shaken out with ether.
The poison, if precipitated at all by lead acetate, must have gone down in one of the preceding fractions.
An alcoholic solution of this substance gave a dark color with ferric chloride and a light colored precipitate with lead acetate.
Therefore the poison, if precipitated by the lead acetate, must have been extracted by the ether.
|lead acetate |
A poisonous, white crystalline compound used in hair dyes, waterproofing compounds, and varnishes. Chemical formula: C4H6O4Pb.