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Why do alkylbenzene sulfonates work better than soap in hard water?
AThey form insoluble calcium salts
BSulfonate binds calcium ions less
CThey have no hydrophobic tail
DSulfonate binds calcium ions more
Answer & Solution
Correct answer: B. Sulfonate binds calcium ions less
The polar sulfonate group is less likely than soap's carboxylate to bind calcium and other hard water ions, so no scum forms.
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