Our sample was made of NiSO4 ∙ 6H2O and NH3 and ethanol. We did 2 trials...

Our sample was made of NiSO4 ∙ 6H2O and NH3 and ethanol. We did 2 trials one tiration with NaOH and another with EDTA solution.

After the NH3 molecules acted as Bronsted bases in the reaction with aqueous HCl they became NH4 + cations. Explain why NH3 can function as a ligand with Ni2+ while NH4 + cannot function as a ligand with Ni2+. Use structures to illustrate your answers.

Thank you.

Homework Answers

Answer #1

We know to behave as a ligand the molecule should have atleast a lone pair of electron.

So now when we look at ammonia (NH3) we see that it has 1 lone pair of electron which it can donate to central metal ion (Ni+2) . Hence it can behave as a ligand

In case of NH4+ we see that the lone pair of electron is lost as the NH3 is ionised to NH4+ . So due to absence of lone pair , the NH4+ cannot donate electrons to central atom . Hence cannot act as ligand .

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