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Which of the following is the strongest acid? (a) \(\mathrm{ClO}_{3}(\mathrm{OH})\) (b) \(\mathrm{ClO}_{2}(\mathrm{OH})\) (c) \(\mathrm{SO}(\mathrm{OH})_{2}\) (d) \(\mathrm{SO}_{2}(\mathrm{OH})_{2}\)

Short Answer

Expert verified
The strongest acid is (a) \(\mathrm{ClO}_{3}(\mathrm{OH})\).

Step by step solution

01

Understand Electronegativity and Number of Oxygens

The strength of an oxyacid generally increases with the number of oxygen atoms present around the central atom because these oxygen atoms increase the acid's ability to donate protons (H鈦). In their conjugate bases, more oxygen atoms can better stabilize the negative charge through resonance.
02

Analyze the Given Acids

Review each given acid:- (a) \( \mathrm{ClO}_{3}(\mathrm{OH}) \): Has 3 oxygens and 1 OH group attached to chlorine.- (b) \( \mathrm{ClO}_{2}(\mathrm{OH}) \): Has 2 oxygens and 1 OH group attached to chlorine.- (c) \( \mathrm{SO}(\mathrm{OH})_{2} \): Essentially \( \mathrm{H_{2}SO_2} \), has 1 oxygen and 2 OH groups attached to sulfur.- (d) \( \mathrm{SO}_{2}(\mathrm{OH})_{2} \): Essentially \( \mathrm{H_{2}SO_3} \), has 2 oxygens and 2 OH groups attached to sulfur.
03

Compare Acid Strength Based on Oxygen Atoms

Now, compare the number of oxygens in each acid, as more oxygens increase acidity:- (a) \( \mathrm{ClO}_{3}(\mathrm{OH}) \) has 3 oxygens.- (b) \( \mathrm{ClO}_{2}(\mathrm{OH}) \) has 2 oxygens.- (c) \( \mathrm{SO}(\mathrm{OH})_{2} \) has 1 effective oxygen.- (d) \( \mathrm{SO}_{2}(\mathrm{OH})_{2} \) has 2 oxygens.The acid \( \mathrm{ClO}_{3}(\mathrm{OH}) \) has the most oxygen atoms, making it the strongest acid.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Oxyacids
Oxyacids are fascinating compounds made up of hydrogen, oxygen, and another element. They play a big role in understanding acid strength. The key to knowing how strong an oxyacid is lies in its structure, specifically the number of oxygen atoms present. Each additional oxygen atom can boost the acid's power to give off hydrogen ions (H鈦), making it more acidic.
This is because oxygen atoms help stabilize the negative charge left when the hydrogen ion departs. This effect is seen in their conjugate bases鈥攖he more oxygen atoms there are, the better they can spread out and stabilize this charge.
In the exercise, we see how oxyacids with different numbers of oxygen atoms are compared, which directly affects their acid strength. For example, oxyacids like \( \mathrm{ClO}_{3}\mathrm{(OH)} \) have three oxygens, which contribute to its strength as an acid compared to other compounds with fewer oxygen atoms.
Electronegativity
Electronegativity is a chemical concept that helps us understand how atoms in a molecule attract the electrons around them. When it comes to acids, the electronegativity of the central atom plays a crucial role in determining the acid's strength.
More electronegative atoms hold onto their electrons more tightly, creating a more polar bond between the hydrogen and the rest of the molecule. This means that the hydrogen atom, which we know as a proton when it forms an ion, is more easily released into the solution, increasing acidity.
Considering the central atoms in oxyacids, such as chlorine in \( \mathrm{ClO}_{3}\mathrm{(OH)} \) and sulfur in \( \mathrm{SO}_{2}\mathrm{(OH)}_{2} \), we can compare their electronegativity. Generally, more electronegative central atoms will enhance an oxyacid鈥檚 strength. This concept is important but isn鈥檛 the sole factor as the total number of oxygen atoms significantly influences acid strength too.
Resonance Stabilization
Resonance stabilization is another fundamental concept that underpins the strength of oxyacids. It refers to the ability of a molecule to distribute its electrons over multiple structures, lowering its energy and increasing stability.
In the context of acids, when an H鈦 ion is released, the remaining structure 鈥 known as the conjugate base 鈥 benefits from resonance stabilization. This happens because the negatively charged electrons can spread over several oxygen atoms.
For instance, in \( \mathrm{ClO}_{3}\mathrm{(OH)} \), once an H鈦 ion is lost, the remaining negative charge is dispersed across three oxygen atoms. This distribution makes the acid more stable and thus stronger. Therefore, acids with more oxygen atoms tend to have better resonance stabilization, supporting their ability to release hydrogen ions readily.

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Most popular questions from this chapter

Match the following: List I List II 1\. \(\mathrm{XeF}_{4}\) (i) distorted octahedral 2\. \(\mathrm{XeF}_{6}\) (ii) tetrahedral 3\. \(\mathrm{XeO}_{3}\) (iii) square planar 4\. \(\mathrm{XeO}_{4}\) (iv) pyramidal The correct matching is 1 2 3 4 (a) (iii) (i) (iv) (ii) (b) (ii) (i) (iii) (iv) (c) (i) (iii) (ii) (iv) (d) (iii) (iv) (i) (ii)

The structure of \(\mathrm{XeO}_{3}\) is (a) linear (b) planar (c) pyramidal (d) T-shaped

Consider the following properties of the noble gases 1\. they readily form compounds which are colourless 2\. they generally do not form ionic compounds. 3\. they have variable oxidation states in their compounds 4\. they generally do not form covalent compounds Select the correct properties. (a) (b) 1,3 (c) \(2,3,4\) (d) \(1,2,3\)

Three reactions involving \(\mathrm{H}_{2} \mathrm{PO}_{4}^{-}\)are given below: (i) \(\mathrm{H}_{3} \mathrm{PO}_{4}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{H}_{2} \mathrm{PO}_{4}^{-}\) (ii) \(\mathrm{H}_{2} \mathrm{PO}_{4}^{-}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{HPO}_{4}^{2-}+\mathrm{H}_{3} \mathrm{O}^{+}\) (iii) \(\mathrm{H}_{2} \mathrm{PO}_{4}^{-}+\mathrm{OH}^{2} \longrightarrow \mathrm{H}_{3} \mathrm{PO}_{4}+\mathrm{O}^{3}\) In which of the above does \(\mathrm{H}_{2} \mathrm{PO}_{4}^{-}\)act as an acid? (a) (ii) only (b) (i) and (ii) (c) (iii) only (d) (i) only

Which of the following species involve \(\mathrm{M}-\mathrm{M}\) bond in addition to \(\mathrm{M}-\mathrm{O}\) bonds? (a) Carbon suboxide (b) Pyrosulphate ion (c) Pyrophosphoric acid (d) Dithionate ion

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