How do you remove magnesium carbonate from table salt to make the salt totally pure?

Answer 1

Magnesium carbonate is practically insoluble in water; dissolve the salt, filter the solution. Magnesium carbonate remain on the filter, the sodium chloride is now in solution. You can use this solution as table salt solution or by evaporation of the water you can obtain pure crystallized NaCl. But I think that it is more simple to buy pure sodium chloride; also, magnesium carbonate is not dangerous and is a common food additive.

Answer 2

One method to remove magnesium carbonate from table salt is to dissolve the salt in water, where magnesium carbonate is insoluble, then filter the solution to separate the solid magnesium carbonate from the salt solution. You can also use recrystallization by dissolving the salt in hot water and allowing it to cool slowly, allowing pure salt crystals to form while leaving impurities behind.