**Question: Which is the strongest acid in aqueous solution?**- Formic acid; \( K_a = 1.7 \times 10^{-4} \)- Hydrofluoric acid; \( K_a = 7.1 \times 10^{-4} \)- Benzoic acid; \( K_a = 6.3 \times 10^{-5} \)- Acetic acid; \( K_a = 1.8 \times 10^{-5} \)**Explanation:** The strength of an acid in an aqueous solution is determined by its acid dissociation constant (\( K_a \)). A larger \( K_a \) value indicates a stronger acid because it means the acid dissociates more completely in solution. Among the options, hydrofluoric acid has the highest \( K_a \) value \( (7.1 \times 10^{-4}) \), making it the strongest acid in this list.

The strength of an acid depends on the dissociation of its ions in aqueous solution; for example an acid gives H+. It can be correlated with the acid dissociation constant value, which can be denoted as ka. The negative logarithm of ka is equal to pKa value. These two factors strongly determines the strength of an acid.An acid with high acid dissociation constant (ka) value is stronger acid than the lower one. Therefore, hydrogen fluoric acid is stronger acid among all with maximum ka value. Hence, the corrrect option first one whose ka value is 7.1×10-4.

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Which is the strongest acid in aqueous solution? Formic acid; Ka = 1.7×10^-4 Hydrofluroic acid; Ka = 7.1×10^-4 %3D Benzoic acid; Ka = 6.3×10^-5 %3D Acetic acid; Ka = 1.8×10^-5

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Chapter1: Chemical Foundations

Section: Chapter Questions

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