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8.5 ACID DEPOSITION (Methods of dealing (post-combustion (SO2 is removed…

- - - - passing exhaust gas through vessel, SO2 can react with alkali/bases
        
        CaCO3 +SO2 :arrow_right: CaSO3 +CO2
  - - - converted to H2S
      - Hydrogendesulfurisation (hydrotreating)- heating crude oil fractions with hydrogen + catalyst
- - - - NO is very reactive,therefore 2NO + O2 :arrow_right: 2NO2
      - NO2 (red brown gas) dissolve easily in H2O
      - During electrical discharges, N2 + O2 :arrow_right: 2NO
      - H2O + 2NO3 :arrow_right: HNO2 + HNO3
      - N is abundantly found in atmosphere,very stable gas
      - HNO3 may further react with O2
      - 2HNO2 + O2 :arrow_right: 2HNO3
      - end product: HNO3 (strong acid)
    - - electrical storms
      - bacterial action
      - internal combustion in jet engine
  - - - volcanic eruption
      - forest fires
      - microbial decay of organic matter
      - industrial combustion
      - sulfur cycle
    - - combustion : S + O2 :arrow_right: SO2
      - reaction with H2O to form sulfurous/sulfuric acid
        
        SO2 +H2O :arrow_right: H2SO3
        
        SO3 + H2O :arrow_right: H2SO4
      - oxidised in sunlight : SO2 + 1/2 O3 :arrow_right: SO3