The reason for the significantly high solubility of AgCIO4 in benzene than in alkane solvents is

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CSIR-UGC (NET) Chemical Science: Held on (26 Nov 2020)
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  1. Alkane solvents are non- polar.
  2. Benzene is an aprotic solvent.
  3. PhAg is formed.
  4. Benzene acts as a soft base

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Option 4 : Benzene acts as a soft base
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Concept:

Solubility:

  • The solubility of a particular solute in a solvent depends on the interaction of the solute particle with the solvent molecules. Better interaction between the solute and solvent particles results in better solubility of the solute in the solvent.

Explanation:

  • Now, for the solubility of AgCIO4 in benzene, we have to consider how Ag+ ions will interact with benzene.
  • The HSAB principle can explain the very high solubility of AgCIO4 in benzene.
  • According to the HSAB principle, Hard acids prefer to combine with a Hard base and Soft acids prefer to combine with a Soft base.     
  • The pi electrons of benzene, a soft Base are available for complex formation with an empty pi orbital of the Ag+ ion, which acts as a Soft acid.
  • Alkane cannot act as a soft base because of the unavailability of pi electrons.
  • This explains the very high solubility of AgCIO4 in benzene.

​Conclusion:

Hence, the reason for the significantly high solubility of AgCIO4 in benzene than in alkane solvents is benzene acts as a soft base.

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