Definitions acid & base

Definition according to Brønsted:

ACID:
any substance that can donate H+-ions

BASE:
any substance that can accept H+-ions


Definition according to Lewis:

ACID:
any substance that can suffer increase of, has room for free electron pairs.
or: a structure that suffers lack of (free) electron pairs.

BASE:
any substance that contains (more than) enough free electron pairs, and that can put available those pairs.


Starting with the following data, you can explain why teeths are more resistant against acids after treatment with fluor(ide).





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