Arsenic trichloride can act both as a Lewis acid and as a Lewis base. Explain why...
Arsenic trichloride can act both as a Lewis acid and as a Lewis
base. Explain why this is so and write a balanced equation for each
using BF3 and Cl− as reaction partners.
1,Write the balanced equation with AsCl3 acting as Lewis
base.
2,Write the balanced equation with AsCl3 acting as Lewis acid.
Homework Answers
As belongs to 15 group of periodic table and has 5 valence electronsin 4th shell.
Then As Cl3 is formed it uses 3 electrons for bond formation , still has 2 electrons as lone pair and vacant 4d orbitals .
Thus when As donates the lone pair to other substances, it behaves as Lewis base and
it As accepts a pair of electrons from other substances into vacant 4d orbitals , it behaves as a Lewis acid.
:AsCl3 + BF3 ----------> Cl3As--> BF3 Lewis base
AsCL3 + Cl- ------------> AsCl4- Lewis acid
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