21 Chemistry -- Non-Metals: Sulphur

What is the role of HCl in detection of Group-II basic radicals?

1 Answers

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 place only when ionic product exceeds solubility product. The solubility of Group II basic radicals is relatively lower. The ionization of hydrogen sulphide is suppressed in the presence of hydrogen ions furnished by HCl (Hydrogen ion acts as a common ion). The remaining sulphide ion is only sufficient to precipitate Group-II basic radicals.

What is difference between concentration and fuming sulphuric acid(h2so4)?

Concentrated Sulphuric Acid has its molecular formula (H₂SO₄) and Fuming Sulphuric Acid or Oleum has its molecular formula (H₂SO₄.SO₃).

Why is Kipps apparatus used instead of simple Woulfe's bottle for the production of sulphurated hydrogen?

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.

Define Hydrosulphuric acid.

The aqueous solution of hydrogen sulphide(H₂S) is termed as Hydrosulphuric acid. It is acidic in nature and has a rotten egg smell. H₂S is a diprotic weak acid.

Why is H2SO4 syrupy viscous?

H₂SO₄ is syrupy viscous because of nature of bond between its molecules. The H₂SO₄ molecules have extensive hydrogen bonding which gives it the syrupy viscous nature.

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