AAYUSHMA SAPKOTA

Kipp's apparatus allows intermittent supply of H₂S (production at irregular intervals). Formation of H₂S in Kipp's apparatus is stopped when dil.H₂SO₄ is not in contact with iron sulphide. When tap key is opened the pressure in 2^ndbulb decreases and level of acid rises, bringing H₂SO₄ in contact with iron sulphides. Since intermittent supply is not possible using Woulfe's bottle, Kipp's apparatus is used instead.

Detection of Group-II basic radicals is done by H₂S. In qualitative salt analysis, they are precipitated in the form of their sulphides(metal sulphides). Precipitation takes placeonly when ionic product exceeds solubility product.The solubility of Group II basic radicals is relatively lower. The ionization of hydrogen sulphide is suppressedin the presence of hydrogen ions furnished byHCl (Hydrogen ion acts as a common ion). The remaining sulphide ion is only sufficient to precipitate Group-II...