A mixture of NaCI(s) and CaCO3(s) is best separated by

Assessment: WAEC SSCE - Chemistry - 1997 (Objective) Subject: Chemistry

Question 1 Report

A mixture of NaCI(s) and CaCO3(s) is best separated by
Answer Details
The best method to separate a mixture of NaCl and CaCO3 is dissolution followed by filtration. This is because NaCl is soluble in water, while CaCO3 is not. By dissolving the mixture in water, NaCl will dissolve, while CaCO3 remains undissolved. Filtration can then be used to separate the insoluble CaCO3 from the solution containing the dissolved NaCl. The other options are not suitable because sublimation is not effective for separating NaCl and CaCO3, and dissolution followed by crystallization and evaporation will only work for the soluble component (NaCl) and not the insoluble component (CaCO3).
Read lesson note on Solubility (JAMB)
Read lesson note on Solubility Of Substances (Ghana Only) (WAEC)
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