Problem: Classify the following as Lewis acids or Lewis bases.(a) BF3(b) Na+(c) OH-(d) SO32-

FREE Expert Solution

We’re being asked to classify each of the given compounds as a Lewis acid or Lewis base


Let’s first define a Lewis acid and a Lewis base.


Based on the Lewis definition:

Lewis acid is an electron pair acceptor.

Some characteristics of a Lewis acid:

When hydrogen is connected to an electronegative element such as P, O, N, S or halogens

▪ hydrogen gains a partially positive charge → makes hydrogen act as a Lewis acid

Positively charged metal ions

▪ can accept negative electron pairs → can act as Lewis Acids

• Central element that has less than 8 valence electrons around it

▪ more likely to accept an electron pair to follow the octet rule

▪ can accept electron pair → can act as Lewis acid

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Problem Details

Classify the following as Lewis acids or Lewis bases.

(a) BF3

(b) Na+

(c) OH-

(d) SO32-

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