Efflorescent salts with four examples each.
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Crystalline hydrated salts- which on exposure to the atmosphere lose their water of crystallisation partly or completely & change in a powder.
The phenomenon is called Efflorescence.
The salts which undergo Efflorescence are called Efflorescent salts.
Egs. CuSO4.5H20, MgSO4.7H20, Na2CO3.10H2O, Na2SO4.10H2O
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The phenomenon is called Efflorescence.
The salts which undergo Efflorescence are called Efflorescent salts.
Egs. CuSO4.5H20, MgSO4.7H20, Na2CO3.10H2O, Na2SO4.10H2O
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In chemistry, efflorescence (which means "to flower out" in French) is the migration of a saltto the surface of a porous material, where it forms a coating. The essential process involves the dissolving of an internally held salt in water, or occasionally in another solvent.
1] A 5 molar concentration aqueous droplet of NaCl will spontaneously crystallize at 45% relative humidity (298 K) to form an NaCl cube by the mechanism of homogeneous nucleation. The original water is released to the gas phase.
2]Gypsum (CaSO4.2H2O) is a hydrate solid that, in a sufficiently dry environment, will give up its water to the gas phase and form anhydrite (CaSO4).
3]Copper(II) sulfate (bluestone) (CuSO4.5H2O) is a blue crystalline solid that when exposed to air, slowly loses water of crystallization from its surface to form a white layer of anhydrous copper(II) sulfate.
4]Sodium carbonate deca hydrate (Na2CO3.10H2O) will lose water when exposed to air.
1] A 5 molar concentration aqueous droplet of NaCl will spontaneously crystallize at 45% relative humidity (298 K) to form an NaCl cube by the mechanism of homogeneous nucleation. The original water is released to the gas phase.
2]Gypsum (CaSO4.2H2O) is a hydrate solid that, in a sufficiently dry environment, will give up its water to the gas phase and form anhydrite (CaSO4).
3]Copper(II) sulfate (bluestone) (CuSO4.5H2O) is a blue crystalline solid that when exposed to air, slowly loses water of crystallization from its surface to form a white layer of anhydrous copper(II) sulfate.
4]Sodium carbonate deca hydrate (Na2CO3.10H2O) will lose water when exposed to air.
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