Solvation Reaction in liquid SO2, Precipitation Reaction in liquid SO2, Complex Formation Reactions in liquid SO2 And Conclusion

 

  1. Solvation Reaction in liquid SO2:

  1. CuSO4 + 5H2O CuSO4 . 5H2O

In this reaction of solvation, the solvent is completely dissolved in the reaction. In this reaction CuSO4 and water undergoes in solvation in the presence of liq. SO2 and produce a product pentahydrate copper sulphate CuSO4 . 5H2O.

  1. CuSO4 + 4NH3 CuSO4 . 4H2O

In this reaction the solvent is completely dissolved in the reaction. In this reaction CuSO4 is reacting with ammonia and undergoes in solvation in the presence of liq. SO2 and produce a product tetrahydrate copper sulphate CuSO4 . 4H2O.

  1. NaI + 4SO2 NaI.4SO2

In this reaction process of solvation is occurring Sulphur dioxide undergoes in solvation to produce SO2. Solvation is the desolvation of solvent completely so four molecules of SO2 completely dissolved in to four molecules of SO2 in product. This reaction took place in the presence of liquid Sulphur dioxide.


  1. Precipitation Reaction in liquid SO2:

When a substance which acts as an acid in liq.SO2 reacts with the metallic salts like KBr, KI, NH(SCN), Ag(CH3COO) etc. in liq.SO2, chloride of the metal is precipitated.


Metallic Salt


Acid


Precipitations of Metallic Chlorides

1.

2KBr

+

SOCl2

2KCl

+

SOBr2

          In this reaction potassium bromide react with thionyl chloride and is precipitated out in the reaction in the presence of liq. SO2.

2.

2KI

+

SOCl2

2KCl

+

SOI2

          The halides on the reaction are precipitated out in the reaction in the presence of liq. SO2.

3.

NH4(SCN)

+

SOCl2

2NH4Cl

+

SO(SCN)2

          The halides on the reaction are precipitated out in the reaction in the presence of liq. SO2.

4.

2Ag(CH3COO)

+

SOCl2

2AgCl

+

SO(CH3COO)2

          In this reaction salt of silver nitrate react thionyl chloride and is precipitated out in the form of metal (silver chloride) sin the presence of liq. SO2.

5.

SbCl3

+

3LiI

SbI3

+

3LiCl

          In this reaction antimony trichloride react with lithium iodide and is precipitated out in the reaction in the presence of liq. SO2.

6.

PbF2

+

Li2SO4

PbSO4

+

3LiCl

          Same is in the case of lead fluoride and lithium sulphite, lead sluphite is precipitated out in the reaction in the presence of liq. SO2.

7.

AlCl3

+

3NI

AlI3

+

3NaCl

          Same is in the case of Aluminum chloride and nitrogen iodide, Aluminum iodide is precipitated out in the reaction in the presence of liq. SO2.

8.

BaI2

+

Zn(CNS)2

Ba(CN)2

+

ZnI2

          The halides on the reaction are precipitated out in the reaction in the presence of liq. SO2.




  1. Complex Formation Reactions in liquid SO2:

When Al(III) or Ga(III) salt (e.g., AlCl3, GaCl3) is treated with a compound containing SO2-3 ions (which act as base in liq. SO2) in liq. SO2 ppt. of Al2(SO3)3 in obtained. This ppt. dissolved in excess of the base due to the formation of soluble sulphito complexes of Al(III). Thus,

  1. 2AlCl3 + 3K2SO3(base)  Al2(SO3)3(ppt.) + 6KCl

Al2(SO3)3(ppt.) + 3K2SO3(base) 2K3[Al(SO3)3] (soluble sulphito complex)

In the complex formation reaction the Coordination complexes are formed in the presence of liq. SO2. 2AlCl3 react with K2SO3 which is acting as a base, they both react to form Al2(SO3)3 which precipitate out in the reaction and also produce the 6KCl. The ppts. of Al2(SO3)3 react with base of K2SO3 to produce the soluble sulphito coordination complex 2K3[Al(SO3)3].

2.   2AlCl3 + 3[N(CH3)4]2SO3(base) Al2(SO3)3(ppt.) + 2[N(CH3)4]Cl

Al2(SO3)2(ppt.) + 3[N(CH3)4]2SO3(base)  2[N(CH3)4]3[Al(SO3)3] (soluble sulphito complex)

In this reaction in the presence of liq. SO2. 2AlCl3 react with [N(CH3)4]2SO3 which is acting as a base, they both react to form Al2(SO3)3 which precipitate out in the reaction and also produce the 6KCl. The ppts. of Al2(SO3)3 react with base of [N(CH3)4]2SO3 to produce the soluble sulphito coordination complex [N(CH3)4]3[Al(SO3)3].



Conclusion

Sulphur dioxide production from fuel combustion will result in its direct release to the environment. On a global basis, fossil fuel combustion for 75 to 85% msn made Sulphur dioxide emission, and industrial processes such as refining and smelting account for the remainder. Sulphur dioxide can react can react with other compounds in the atmosphere and form fine particles that result in haze that reduce visibility. Particulate matter pollution is the major cause of haze in parts of the US. Sulphur dioxides production and use in preserving fruits, vegetables; disinfectants in breweries and food factories; bleaching textile fibers, straw, wicker ware, gelatin, glue, beet sugars, solvent and reagent in inorganic synthesis may result in its release to the environment through various waste streams. Its use as a fungicide and acaridae in the wine industry will result in its release to the direct release to the environment. Sulphur dioxide is released to the air from volcanic activity and eruptions. It released to the air, a vapour pressure of 3.0X10+3 at 25 deg C indicates Sulphur dioxide will exist solely as a gas in the atmosphere. Gas phase Sulphur dioxide is oxidized rapidly by homogenous and heterogeneous reactions. The oxidation of Sulphur dioxide to sulfuric acid and sulfates in the atmosphere is an important contributor to air pollution, specifically producing acid rain.


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