Question

consider the reaction... Explain the reaction in terms of the Lewis' acid-base theory.

Explain 3 significant ways in which the Bronsted-Lowry theory and the Arrhenius theory differ in their definition of acids and bases.

Now go back to the product in part 6a and explain the kind of isomerism that the compound displays and why such isomerism arises.

[Ni(en)3]2+(aq) c. Considerthe reaction, Explain the reaction in terms of the Lewis' acid-base theory Ni2+ (aq) +3(NHzCH2CH2NHz) (aq) 6a. 6b.Explain 3 significant ways in which the Bronsted-Lowry theory and the Arrhenius theory differ in their definition of acids and bases. 6c. Now go back to the product in part 6a and explain the kind of isomerism that the com displays and why such isomerism arises. pound 3

Answer 1

6.(a): Ethylene diamine(H2NCH2CH2NH2) is a didentent ligand in which the two N - atoms donate lone pair electron to Ni²⁺(aq) to form [Ni(en)₃]²⁺ . Hence ethylene diamine(en) acts as Lewis base as it donates lone pair electron and Ni²⁺(aq) acts as lewis acid as it accepts the lone pair electron.

(b): According to Bronsted Lowry theory an acid is a substance that donates proton and a base is a substance accepts proton during an acid base reaction.

According to Arrhenius theory an acid is a substance that dissociates in water to form H+ ion and base is a substance that dissociates in water to form OH- ion.

Arrhenius theory is only based on H+ and OH- ion, where as Bronsted Lowry theory is based on proton only.

All arrhenius acids and bases are Bronsted and Lowry acids and bases respectively, however reverse is not true.

(c):  [Ni(en)₃]²⁺ shows optical isomerism, because the mirror images are not superimposable.