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← ScienceWhich outcome occurs when solid anhydrous copper(II) sulfate is exposed to humid air?
A)Hydration into copper(II) sulfate pentahydrate✓
B)Sublimation directly into gaseous copper sulfate
C)Decomposition forming copper(II) oxide
D)Oxidation into copper(III) sulfate
💡 Explanation
Blue copper(II) sulfate pentahydrate forms because the solid undergoes a phase change driven by the hygroscopic nature and spontaneous hydration. Therefore, the anhydrous powder hydrates rather than sublimating or oxidizing, because of water availability.
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