Compare the two protons H₁ and H₂ shown in the following compound and identify which proton is more acidic.

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Removing H₁ gives the sulfonate : structure

Removing H₂ gives the nitrogen anion : structure

Factor (1) atom : oxygen holds the negative charge better than nitrogen, and the sulfonate is further stabilised by resonance over the sulfonyl oxygens. The O-H proton H₁ is more acidic.

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