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The correct order of acidic strength is
Option: 1
$\mathrm{H}_2 \mathrm{O}>\mathrm{D}_2 \mathrm{O}>\mathrm{H}_2 \mathrm{O}_2$

Option: 2
$\mathrm{D}_2 \mathrm{O}>\mathrm{H}_2 \mathrm{O}<\mathrm{H}_2 \mathrm{O}_2$

Option: 3
$\mathrm{D}_2 \mathrm{O}<\mathrm{H}_2 \mathrm{O}<\mathrm{H}_2 \mathrm{O}_2$

Option: 4
$\mathrm{H}_2 \mathrm{O}=\mathrm{D}_2 \mathrm{O}=\mathrm{H}_2 \mathrm{O}_2$

Answers (1)

best_answer

$\mathrm{H}_2 \mathrm{O}_2$ gives 2 hydrogen ions in aqueous solution whereas water gives 1 hydrogen ion. As $\mathrm{H}_2 \mathrm{O}_2$ protonates to a larger extent than water in aqueous solution, hence, it has a larger Ka(acid dissociation constant), thus making it a stronger Bronsted-Lowry acid than water.

In between $\mathrm{H}_2 \mathrm{O}$ and $\mathrm{D}_2 \mathrm{O}$ , The reason for this is that the atoms in the molecules keep vibrating and the bonds of H being slightly weaker than D are easily delocalised. (due to heavier weight of D than H, the vibrations are weaker and thus the bonds are stable). Hence $\mathrm{H}_2 \mathrm{O}$ is slightly acidic than $\mathrm{D}_2 \mathrm{O}$

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Divya Prakash Singh

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