Question

Which of the following are lewis acids?
h2o, bf3 ,h+, nh4+

Answer 1

Answer:

bf3, Nh4+, H+ are Lewis acids because these are electron deficient and accept lone pair of electrons ..

Answer 2

$BF_3$ and $H^+$ are lewis acids

Explanation:

According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs.

As $BF_3$ is a covalent compound which contains 6 electron pairs and thus is short of two electrons to complete its octet, thus it can easily accept an electron pair from a lewis base. Also $H^+$ can also accept electrons, thus it is also a lewis acid.

$H_2O$ and $NH_4^+$ have their octets complete.

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