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(C) $EDTA$ is used for the estimation of $Ca^{2+}$ and $Mg^{2+}$ ions.$EDTA$ has four carboxyl groups and two amine groups that can act as electron pa

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both $Ca^{2+}$ and $Mg^{2+}$ ions

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(C) $EDTA$ is used for the estimation of $Ca^{2+}$ and $Mg^{2+}$ ions.$EDTA$ has four carboxyl groups and two amine groups that can act as electron pair donors or Lewis bases.The ability of $EDTA$ to potentially donate its six lone pairs of electrons for the formation of coordinate covalent bonds to metal cations.In alkaline conditions $(pH > 9)$,it forms stable complexes with the alkaline earth metal ions $Ca^{2+}$ and $Mg^{2+}$.The $EDTA$ reagent can be used to measure the total quantity of dissolved $Ca^{2+}$ and $Mg^{2+}$ ions in a water sample.Thus,the total hardness of a water sample can be estimated by titration with a standard solution of $EDTA$.

$EDTA$ is used in the estimation of

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