Sulfur

Question 1

sources of sulfur

Answer 1

● Volcanoes
● Obtained​ ​from​ ​some​ ​metal​ ​ores​ ​like​ ​Copper​ ​pyrites​ ​(CuFeS​2)​ ​ ​and​ ​Blende​ ​(ZnS) and​ ​other​ ​purification​ ​processes,​ ​as​ ​all​ ​living​ ​things​ ​and​ ​fossils​ ​contain​ ​sulfur

Question 2

manufacture of sulfuric acid by the Contact process

Answer 2

● Make​ ​sulfur​ ​dioxide:
o S​ ​+​ ​O2​ ​​ ​→​ ​SO​2
o Sulfur​ ​is​ ​burned​ ​in​ ​air
● Convert​ ​sulfur​ ​dioxide​ ​into​ ​sulfur​ ​trioxide
o 2SO2​ ​​ ​+​ ​O​2​​ ​⇌​ ​2SO3​
o Reversible​ ​reaction
o Catalyst​ ​of​ ​vanadium(V)​ ​oxide,​ ​V​2O​ ​5 
o Temperature​ ​of​ ​around​ ​450 ̊C
o Pressure​ ​of​ ​2​ ​atm.
● Convert​ ​sulfur​ ​trioxide​ ​into​ ​sulfuric​ ​acid 
oH2​O​​​+​​SO​3​​​→​​H2​S​O​4
o Reacted​ ​with​ ​water

Question 3

use of sulfur in the manufacture of sulfuric acid

Answer 3

Sulfur​ ​is​ ​burned​ ​in​ ​air​ ​/​ ​reacted​ ​with​ ​oxygen​ ​to​ ​form​ ​sulfur​ ​dioxide​ ​which​ ​is​ ​later converted​ ​to​ ​sulfur​ ​trioxide​ ​and​ ​finally​ ​sulfuric​ ​acid

Question 4

uses of sulfur dioxide

Answer 4

● A​ ​bleach​ ​in​ ​the​ ​manufacture​ ​of​ ​wood​ ​pulp​ ​for​ ​paper
● A​ ​food​ ​preservative​ ​(by​ ​killing​ ​bacteria)

Question 5

properties and uses of dilute and concentrated sulfuric acid

Answer 5

Sulfuric​ ​acid​ ​properties:
● strong​​ acid​​(fully ​​dissociates ​​in​​ solution ​​to ​​release ​​H​+​​i​​ons)
● corrosive​ ​(concentrated​ ​is​ ​more​ ​corrosive​ ​than​ ​dilute)
● good​ ​electrolyte
Uses​ ​of​ ​sulfuric​ ​acid:
● Production​ ​of​ ​fertilisers
● Manufacture​ ​of​ ​chemicals​ ​e.g.​ ​HCl,​ ​HNO​3,​ ​ ​sulfate​ ​salts,​ ​synthetic detergents,​ ​dyes​ ​and​ ​pigments,​ ​explosives​ ​and​ ​drugs
● In​ ​petroleum​ ​refining​ ​to​ ​wash​ ​impurities​ ​out​ ​of​ ​gasoline​ ​and​ ​other refinery​ ​products
● In​ ​processing​ ​metals
● Rayon​ ​is​ ​made​ ​with​ ​sulfuric​ ​acid.​ ​It​ ​serves​ ​as​ ​the​ ​electrolyte​ ​in​ ​the
lead-acid​ ​storage​ ​battery