alleryDetergents work better than soaps in hard water because:
Athey kill bacteria fast
Bno scum with Ca/Mg ions
Cthey need less water amt
Dthey lather faster always
Answer & Solution
Correct answer: B. no scum with Ca/Mg ions
Soap heads are carboxylate (–COO⁻) and form insoluble scum with Ca²⁺/Mg²⁺.
Detergent heads are sulfonate (–SO₃⁻), which do not form scum, so detergents lather in hard water.
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