Which of the following compounds crystallizes without water of crystallization?

Assessment: WAEC SSCE - Chemistry - 1990 (Objective) Subject: Chemistry

Question 1 Report

Which of the following compounds crystallizes without water of crystallization?
Answer Details
The compound that crystallizes without water of crystallization is NaCI (sodium chloride). When some compounds crystallize, they form a specific number of water molecules as part of their crystal structure. These water molecules are called water of crystallization. For example, CuSO4⋅5H2O means that each CuSO4 unit is bonded to 5 water molecules. However, NaCI does not form water of crystallization when it crystallizes. Instead, the sodium ions (Na+) and chloride ions (CI-) bond together in a lattice structure without any water molecules. This is why NaCI is known as an anhydrous compound. Therefore, the compound that crystallizes without water of crystallization is NaCI.
Read lesson note on Acids, Bases And Salts (JAMB)
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