Oxoacids Of Sulfur

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Which is the strongest acid among given sulfur oxoacids?

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1. **Caro's Acid ($H_2SO_5$)**: Peroxomonosulfuric acid features a Sulfur atom in the $+6$ oxidation state and a peroxy linkage (\u2013O\u2013O\u2013).
2. **Acidity Factors**: Generally, acidity increases with: 
   - Higher oxidation state of central atom ($S$ is $+6$ in $H_2SO_4$ and $H_2SO_5$).
   - Greater number of terminal Oxygen atoms ($=O$) which stabilize the conjugate base through delocalization and inductive effects.
3. **Comparison**: $H_2SO_5$ is slightly stronger than $H_2SO_4$. $H_2SO_3$ is a weak acid ($S$ in $+4$). $H_2S$ is a very weak hydracid.
4. **Note**: In $H_2SO_5$, the electron-withdrawing nature of the peroxy group further enhances the acidity of the terminal $OH$ group.

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Oxoacids Of Sulfur

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