Suppose you have a mixture of
Suppose you have a mixture of solid potassium chloride andmagnesium carbonate. The physical and chemical properties ofpotassium chloride are similar to those of sodium chloride, and theproperties of magnesium carbonate are similar to those of calciumcarbonate.
a.draw a flowchart that shows how you would separate and recoverthe two components of this mixture.
Answer:
The major difference between these two salts that can beexploited for their separation is their solubility in water.Potassium chloride is freely and highly soluble in water whilemagnesium carbonate has a very low solubility of 0.0139g/100mL ofwater at STP, which can be taken for practical purposes asinsoluble when we consider KCl with a solubility of 35.5g/100mL ofwater again at STP.
Therefore, the given mixture of salts can be dissolved a bareminimum quantity of water to give a pure precipitate of magnesiumcarbonate, which will remain insoluble in water after KCl hassaturated the aqueous phase. This precipitate can be filtered outand dried to obtain magnesium carbonate. The water solublepotassium chloride can now be got by simple evaporation of waterfrom the KCl solution which results in crystals of the pure salt aswater starts boiling off. Since the salt is highly stable, boilingthe salt solution will not result in any decomposition.
If this method is carried out deionized water, pure and precisequantities of each salt can be obtained and from the weight of themixture and the weight of individual salts, their mass percentagecan also be calculated.
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