Which chemical removes both temporary and permanent hardness in water?
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a
MgCO3
b
CaCO3
c
MgCl2
d
Na2CO3
answer is D.
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Detailed Solution
Na2CO3 removes both temporary and permanent hardness. Following are the chemical reactions.CaCl2+Na2CO3→CaCO3+2NaClCaHCO32+Na2CO3→CaCO3+2NaHCO3Soluble chlorides and bicarbonates of calcium are converted into insoluble carbonates, which can be removed by filtration.