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This is a table given in a text book regarding hard acids

How come BF3 is a harder acid than BBr3?

My reasoning: To check which is harder:

1.Both difficult to polarize 2.Both similar in size

It comes down to which has higher positive charge on the B atom. Since there is effective back bonding in BF3, I feel that BBr3 should have higher charge on B, so it should be harder.

Why is the actual answer reversed? Am I on the right track comparing charges on B?

Thanks in advance!

  • $\begingroup$ They aren't similar size. $\endgroup$ – Mithoron Sep 12 at 19:11

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