Water from different places produces varying amount of lather when soap or detergents are added to them. What could be the reason? Do the metallic substances play any role in this?

Dear student,
Since water from the different places have different concentrations of the dissolved minerals like Ca+2 or Mg+2 carbonates / bicarbonates / chlorides / sulphates that is why the sample of water has varity of hardness , which leads the different formation of leather on adding soaps or detergents.
Regards

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