Exp. 4 Sublimation
Needle-like
Before heating salicylic acid
Powder-like
Before heating sodium sulfate
Sublimation
Direct conversion of a substance from solid to gas without passing through liquid state
High vapor pressure, low melting point, more volatile
Properties of substances which undergo sublimation
Formation of white powder(Sodium sulfate)
Residue or Sublime
No reaction
Salicylic acid + Barium Chloride
Colorless solution with crytals
Salicylic acid + H2O + BaCl
Sodium Chloride + Barium Sulfate
Sodium sulfate + Barium Chloride
Cloudy solution with white precipitate
Sodium sulfate + H2O + BaCl2
Formation of crystals (Salicylic acid)
Sublimate
Volatility
Sublimation is based on
Similar vapor pressure
Sublimation is limited to compound having...
Deposition
The opposite of sublimation
Volatilize
While heating salicylic acid
Remained
While heating sodium sulfate
Barium Sulfate
White precipitate
