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Which of the following correctly represents the structure of peroxodisulfuric acid (H2S2O8)?

1. HO-S(=O)2-SH
2. HO-S(=O)2-S(=O)2-OH
3. HO-S(=O)2-S(=O)2-S(=O)2-OH
4. HO-S(=O)2-O-O-S(=O)2-OH

Correct answer: HO-S(=O)2-O-O-S(=O)2-OH

Solution

Peroxodisulfuric acid (Marshall's acid, H2S2O8) has the structure: HO-S(=O)2-O-O-S(=O)2-OH. Each sulfur is surrounded by four oxygens (two =O, one -OH, one -O- of the peroxide bridge). The characteristic feature is the -O-O- (peroxide) bond connecting the two SO3(OH) units.

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