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asked in Chemistry by (22k points)

The presence of which salts in water predefines permanent hardness of water? 

А.  Mg(HCO3)2

B.  Na3PO4

C.  KCl

D.  Ca(HCO3)2

E. MgCl2 

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The presence of MgCl2 salts in water predefines permanent hardness of water.

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