December 07, 2022, 04:22:11 AM
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Topic: PF3 + F2 -> PF5 -- Lewis acid/base  (Read 3994 times)

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Offline denverkid

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PF3 + F2 -> PF5 -- Lewis acid/base
« on: March 28, 2017, 05:26:56 PM »
I am learning about Lewis acids and bases and "adducts." We did some exercises, so Lewis acid = something that can accept electrons and Lewis bases donate electrons. According to my textbook, PF3 + F2  :rarrow: PF5 does NOT represent the formation of a Lewis acid-base adduct. Is it because F2 is not a Lewis base (if not, I don't understand why it isnt)? Or is it becuz each F gets added on separately instead of as one entity?

Additionally, can a Lewis acid/base adduct refer to two added particles? For example if there is some reaction

A + 2B  :rarrow: AB2, where A is a Lewis acid and B is a Lewis base, but it goes through two steps:
A + B :rarrow: AB
AB + B :rarrow: AB2

Would you still call A + 2B :rarrow: AB2 a Lewis acid-base adduct, or would you have to refer to each step individually?

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