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Chapter 15: Problem 144

Which of the following does not represent a Lewis acid-base reaction? (a) \(\mathrm{H}_{2} \mathrm{O}+\mathrm{H}^{+} \longrightarrow \mathrm{H}_{3} \mathrm{O}^{+}\) (b) \(\mathrm{NH}_{3}+\mathrm{BF}_{3} \longrightarrow \mathrm{H}_{3} \mathrm{NBF}_{3}\) (c) \(\mathrm{PF}_{3}+\mathrm{F}_{2} \longrightarrow \mathrm{PF}_{5}\) (d) \(\mathrm{Al}(\mathrm{OH})_{3}+\mathrm{OH}^{-} \longrightarrow \mathrm{Al}(\mathrm{OH})_{4}^{-}\)

Short Answer

Expert verified
Option (c) does not represent a Lewis acid-base reaction.

Step by step solution

01

Determine Lewis Acids and Bases

First, inspect each chemical equation and determine if there are species that act as Lewis acids (electron pair acceptors) and Lewis bases (electron pair donors). An acid-base reaction should involve transfer of an electron pair from the base to the acid.
02

Analyzing each reaction

For (a), \(H_{2}O\) acts as a Lewis base by donating an electron pair to \(H^{+}\), which acts as a Lewis acid. For (b), \(NH_{3}\) acts as a Lewis base by donating an electron pair to \(BF_{3}\), which acts as a Lewis acid. For (d), \(Al(OH)_{3}\) acts as a Lewis acid by accepting an electron pair from \(OH^{-}\), which acts as a Lewis base.
03

Identify the non-Lewis acid-base reaction

Upon inspection, the reaction (c) does not meet the criteria as there is no species that acts as a Lewis base, and \(F_{2}\) doesn't act as a Lewis acid. Instead, it is a normal bond formation reaction. Thus, option (c) does not represent a Lewis acid-base reaction.

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Most popular questions from this chapter

Determine the concentration of a \(\mathrm{NH}_{4} \mathrm{Cl}\) solution that has a pH of 5.64 .

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Why do we normally not quote \(K_{\mathrm{a}}\) values for strong acids such as \(\mathrm{HCl}\) and \(\mathrm{HNO}_{3}\) ? Why is it necessary to specify temperature when giving \(K_{\mathrm{a}}\) values?

Define salt hydrolysis. Categorize salts according to how they affect the \(\mathrm{pH}\) of a solution.

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