***For Purification of Sodium Chloride experiment please answer the following: 1- Is it practicable to use CaCl 2 , inst

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***For Purification of Sodium Chloride experiment please answer the following: 1- Is it practicable to use CaCl 2 , inst

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***For Purification of Sodium Chlorideexperiment please answer the following:
1- Is it practicable to use CaCl 2 ,instead of the more toxic BaCl 2 , to removeSO 4 2‒ ?
2- Can we use other soluble carbonates other thanNa 2 CO 3 to removeCa 2+ , Mg 2+ , SO 4 2‒ ? Andwhy?
3- Why the pH of solution should be adjusted to 3~4 whenremoving CO 3 2‒ , ​​and howabout ~pH 7.0 ?
4- Can tap water be used to dissolve the coarse salt ?
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