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Detergents remain effective in hard water, unlike ordinary soap, mainly because

Question
Detergents remain effective in hard water, unlike ordinary soap, mainly because
They have no ionic end at all
Their charged ends do not form insoluble precipitates with calcium and magnesium ions
They are much more expensive
They contain no hydrocarbon chain
Answer
Their charged ends do not form insoluble precipitates with calcium and magnesium ions
Detailed Explanation
Detergents' charged ends do not form insoluble precipitates with hard-water ions, unlike soap, so they remain effective.
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