Define two method by which we can soften the water sample.

Answer

There are some method by which we can soften the water sample .
`{:("(a)","By boiling :",2HCO_(3)^(-)rarrH_(2)O+CO_(2)CO_(3)^(2-),),("or","By Slaked lime :",Ca(HCO_(3))_(2)+Ca(OH)_(2)rarrCaCO_(3)+2H_(2)O,),(,,Ca^(2+)CO_(3)^(2-)rarrCaCO_(3),),("(b)","By Washing Soda :",CaCl_(2)+Na_(2)CO_(3)rarrCaCO_(3)+2NaCl,),("(c)"," ionexchange resins",Na_(2)R+Ca^(2+)rarrCaR+2Na^(+),),("(d)","By adding chelating agents like",(PO_(3)^(-))_(3)"etc.",):}`