写出精制氯化钠的步骤以及涉及到的化学方程式。 （高一化学）
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NaCl=Na++Cl-
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Na2SO4 + BaCl2== BaSO4 + 2NaClCaCl2 + Na2CO3 == CaCO3 + 2NaCl
MgCl2+ 2NaOH= Mg(OH)2 + 2NaCl
BaCl2 + Na2CO3 == BaCO3 + 2NaCl
Na2CO3 + 2HCl == 2NaCl + H2O + CO2
氯气中点燃金属钠，得到氯化钠，方程式手机真写不出来啊
是粗盐提纯吗？
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