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The method of purification of crude salt and the chemical equation of adding reagents before and after
1, add BaCl2:

BaCl2+Na2SO4==BaSO4(precipitate)+2NaCl

2, add NaOH:

MgCl2+NaOH==Mg(precipitate)+2NaCl

3, add Na2CO3:

CaCl2+ Na2CO3==CaCO3(precipitate)+2NaCl

BaCl2+Na2CO3==BaCO3(precipitate)+2NaCl

4.After adding dilute hydrochloric acid:

NaOH+HCl==NaCl+H2O

Na2CO3+HCl==NaCl+CO2+ H2O

Please take the answer

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