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Chapter 6: Problem 25

Which of the following acts as both Bronsted acid and Lewis acid? (a) \(\mathrm{Cu}^{+2}\) (b) \(\mathrm{SO}_{2}\) (c) \(\mathrm{Fe}^{+3}\) (d) \(\mathrm{NH}_{4}{ }^{+}\)

Short Answer

Expert verified
a) Cu²⁺ b) SO₂ c) Fe³⁺ d) NH₄⁺ Answer: None of the given options acts as both a Bronsted acid and a Lewis acid.

Step by step solution

01

Understanding the concept of Bronsted acid and Lewis acid

A Bronsted acid is a substance that can donate protons (H+ ions) to another substance, while a Lewis acid is a substance that can accept an electron pair from a Lewis base. To find a substance that acts as both Bronsted and Lewis acid, we need to examine their chemical structure and reactivity.
02

Analyzing option (a) \(\mathrm{Cu}^{+2}\)

Cu²⁺ is a copper ion with a charge of +2. This ion has empty d-orbitals that can accept an electron pair, but it does not possess any protons (H+ ions) to donate. So, it can act as a Lewis acid, but not as a Bronsted acid.
03

Analyzing option (b) \(\mathrm{SO}_{2}\)

SO₂ is a molecule comprised of one sulfur atom and two oxygen atoms. In normal circumstances, it does not have any protons to donate, and also it has sulfur-oxygen double bond which does not accept electrons as it forms sulfur-oxygen single bond on accepting a lone pair, so it doesn't act as a Bronsted acid or a Lewis acid.
04

Analyzing option (c) \(\mathrm{Fe}^{+3}\)

Fe³⁺ is an iron ion with a charge of +3. This ion has empty d-orbitals that can accept an electron pair, but it does not possess any protons (H+ ions) to donate. So, it can act as a Lewis acid, but not as a Bronsted acid.
05

Analyzing option (d) \(\mathrm{NH}_{4}{ }^{+}\)

NH₄⁺ is an ammonium ion containing one nitrogen atom bonded to four hydrogen atoms. NH₄⁺ has a positive charge and can donate a proton (H+ ion) to a base, so it can act as a Bronsted acid. However, NH₄⁺ does not have any empty orbitals to accept an electron pair, so it cannot act as a Lewis acid.
06

Conclusion

After analyzing all the given options, we can conclude that none of them acts as both a Bronsted acid and a Lewis acid.

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Most popular questions from this chapter

Which of the following is not a base according to any of the theories? (a) \(\mathrm{Mg}(\mathrm{OH})_{2}\) (b) \(\mathrm{NH}_{3}\) (c) \(\mathrm{H}_{2} \mathrm{PO}_{4}^{-}\) (d) \(\mathrm{BF}_{3}\)

Which of the following salts can produce only two types of radicals? (a) \(\mathrm{NaKCO}_{3}\) (b) \(\mathrm{CaOCl}_{2}\) (c) \(\mathrm{NH}_{4} \mathrm{HSO}_{4}\) (d) \(\mathrm{Na}\left(\mathrm{NH}_{4}\right) \mathrm{HPO}_{4}\)

State whether the following statements are true or false. Curd is sour in taste due to the presence of an acidic substance.

According to Lewis theory, neutralization is the (a) transfer of proton from acid to base (b) transfer of proton from base to acid (c) transfer of electron pair from acid to base (d) transfer of electron pair from base to acid

According to Lewis acid-base concept, which is a correct statement? (a) Species in which central atom has completed octet cannot act as acid. (b) All negatively charged ions are acids. (c) Molecule in which the central atom has vacant \(" \mathrm{~d}^{\prime \prime}\) orbitals acts as acid. (d) All positively changed ions are bases.
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