Exp. 4 Sublimation

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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


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