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Topic: ions  (Read 4544 times)

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lena

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ions
« on: December 12, 2004, 11:22:29 PM »
 ???I wonder why do some ions precipitate as  hydroxides while other do not?
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HongKongALevelboy

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Re:ions
« Reply #1 on: December 13, 2004, 02:48:16 AM »
   It s about the solubilities of metal hydroxide . According ot the equation : enthalpy change of solubility = enthalpy change of hydration - enthalpy change of lattice . The more negative the solubility enthalpy is , the more soluble the metal hydroxide is .
   For group 1 , the size of metals are larger than that of other metal ions .Going across the period from group 1 , the change in lattice enthalpy is larger than that of hydration enthalpy . Therefore ,the enthalpy change of solubility become positive . Group 2 and transition metals are mostly insoluble in water and form precipatate .
   that s all i know , can anybody explain more about it ?
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Offline Donaldson Tan

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Re:ions
« Reply #2 on: December 18, 2004, 02:22:57 PM »
the gist is: if the final hydroxide product is insoluble in water, precipitation occurs.
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"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

pizza1512

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Re:ions
« Reply #3 on: January 17, 2005, 09:04:58 AM »
It all depends on where it is in the relativity table...

 ::)
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