1
The precipitate will contain the phosphorus, together with any arsenic acid not reduced by the sulphuretted hydrogen.
2
It was first made from aniline by the agency of mercurial salts, and afterward by that form of arsenic known to chemists as arsenic acid.
3
After oxidizing the arsenic in 0.5000 gram of pure As_{2}S_{3} to arsenic acid, it is precipitated with "magnesia mixture" (MgCl_{2} + 2NH_{4}Cl).