I learned that because synthetic detergent doesn't make strong dative bond with $\ce{Ca^2+}$ or $\ce{Mg^2+}$, you could use it in hard water. But I couldn't understand why soap makes strong dative bond and synthetic detergent doesn't. For example, why $\ce{-SO3-}$ doesn't make strong enough dative bond to make scum with $\ce{Ca^2+}$?
What is the reason you could use synthetic detergent in hard water?
satoru kurita
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