Lewis Acid- Base

[beanie92]

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I'm so confused -.- Can someone please help me explain this question?

What's the Lewis Acid among NaAlCl4, HF, and BF3?

The answer is BF3 but i dont understand why.. HF could be an acid too...

Can you please explain to me why NaAlCl4 and HF cannot be acidic in this case?

THank you very much 🙁

 

[beanie92]

Ehhhh btw i was just wondering if i can ask acouple more questions here or i have to make a new thread...im just afraid there woud be so many threads though lol

 

[TieuBachHo]

HF is an acid but not LEWIS acid. What is a Lewis acid? they are electron-pair acceptors. The other one is a salt NaAlCl4? Only BF3 fits the bill.

 

[deleted329605]

I'm so confused -.- Can someone please help me explain this question?

What's the Lewis Acid among NaAlCl4, HF, and BF3?

The answer is BF3 but i dont understand why.. HF could be an acid too...

Can you please explain to me why NaAlCl4 and HF cannot be acidic in this case?

THank you very much 🙁

It's an octet rule problem. Atoms like to have their outer octet filled, BF3 has 6 e-, if it accepts another pair it'll have 8.

 

[beanie92]

Oh ok, but not being a Lewis acid doesnt make it a lewis base right? Cuz i will not understand either if it is a lewis base :|

btw are you vietamese?

 

[beanie92]

It's an octet rule problem. Atoms like to have their outer octet filled, BF3 has 6 e-, if it accepts another pair it'll have 8.

Thanks👍

 

[TieuBachHo]

Oh ok, but not being a Lewis acid doesnt make it a lewis base right? Cuz i will not understand either if it is a lewis base :|

btw are you vietamese?

Ua`. Premed hay Prepharm? Man, coi bo^. you still have a long road ahead LOL. Just kidding. No, that doesn't make it a lewis base ... It's still an acid b/c it can donate its proton (Lowry-Brønsted acid) - Just not a Lewis one. Lewis bases are e- pair donors