Question

Hard water is not a good choice to use in daily life.
Comment and suggest some methods to remove the hardness of water.​

Answer 1

1.Boiling

Boiling removes temporary hardness.(hardness causes due to metal (M²+) carbonates and bicarbonates.

2.treatment with EDTA(ethylene diamine tetra acetate)

Metal(M²+) carbonates/bicarbonates when treated with erichrome black t (EBT) gives out MetalEBT (MEBT)

where EBT is dark blue and M-EBT is wine red.

Metal EBT (M EBT) is unstable complex.

then wine red M-EBT is titrated with EDTA. M-EDTA is formed. pH of 10 is required for reaction to undergo completion. M-EDTA formed is blue.

the time at which wine red complex is converted to blue is called eqivalence point

Answer 2

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Hard water is not a good choice to use in daily life. This is because due to hard water in washing of clothes, soaps are not able to form lather/foam and their cleansing action decreases. Also it is unsafe for drinking purposes.

To remove temporary hardness of water we can boil it. Hard water contain Calcium or Magnesium carbonates. Boiling doesn't affect permanent hardness of water.

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