Knowledge points of chemical crude salt purification in grade three

Are you talking about this process:

"Crude salt → dissolution →BaCl2 solution →NaOH solution →Na2CO3 solution → filtration → filtrate → hydrochloric acid → evaporative crystallization → refined salt"

There are only two masses here, one is the mass of the original salt before dissolution, which contains insoluble impurities, and the other is the mass of the final refined salt. After the previous steps of impurity removal, soluble impurities finally react with hydrochloric acid to generate sodium chloride, and the final mass should be subtracted from the mass of sodium chloride equal to the added sodium ions, that is, the mass of sodium chloride contained in your original salt.

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