Crystals of Na2CO3. 10H2O when exposed to air_________________?
Correct answer: A. Lose water and remain solid
- A. Lose water and remain solid
- B. Gain water and remain solid
- C. Gain water and become liquid
- D. Remains unchanged
Explanation
Na2CO3.10H2O is an efflorescent crystal, so it loses some water of crystallization when exposed to dry air. The crystals therefore become anhydrous or less hydrated while remaining solid. Students may choose c by confusing efflorescence with deliquescence, in which a solid absorbs moisture and liquefies.
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About Crystalline Solids
Crystalline solids contain particles arranged in a regular repeating lattice described by a unit cell. Their study includes coordination number, packing efficiency, density, anisotropy, cleavage, polymorphism and common crystal systems, along with ionic, molecular, covalent network and metallic crystals. Crystalline order differs from the random arrangement of amorphous solids.
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