Sulfur

sulfuric acid

Oleum mixed with water to form ________.

Sulfur trioxide

________ is then dissolved in sulfuric acid to form OLEUM.

Sulfur dioxide

________ mixed with more air to form sulfur trioxide.

sulfuric acid

Concentrated ________ can be used as dehydrating agent.

→ Conditions for contact process

Vanadium oxide as a catalyst at 450C

Sources of Sulfur:

Underground beds; Mexico, Poland and USA

Around volcanoes

Compound in metal ores; Galena (PbS), Copper pyrites (CuFeS2) and Zinc Blende (ZnS)

Occur naturally in fossil fuels

Properties of Sulfur:

Brittle Yellow solid

Allotropes; Rhombic sulfur and monoclinic sulfur

Low melting point (Molecular)

Non-conducting/ Insulator

Insoluble

Reacts with metals to form sulfides

Burns in air to form sulfur dioxide

Contact Process:

Sulfur burned in air

S + O2 → SO2

Sulfur dioxide mixed with more air to form sulfur trioxide

→ Conditions for contact process: Vanadium oxide as a catalyst at 450C

→ 2SO2 + O2 → 2SO3

Sulfur trioxide is then dissolved in sulfuric acid to form OLEUM

→ SO3 + H2SO4 → H2S2O7

Oleum mixed with water to form sulfuric acid

→H2S2O7 + H20 → 2H2SO4