Which of the following is used as water softener?

Na₂CO₃.10H₂O

CuSO₄. 5H₂O

MgSO₄. 7H₂O

CaCI₂.2H₂O

Na₂SO₄. 10H₂O

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Horlaniyimosh

3 years ago

this is because displacement reaction between sodium ion and calcium ion since sodium is higher than calcium in the electrochical series .Hence,sodimtrioxocarbonate(iv)deca hydrate,Na2CO3.10H20 is used in the treatment of permanent hardness
Na2CO3.10H20+CaSO4---->CaCO3. + NaSO4 +10H2O
soluble. insoluble