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posted by  ashbey on 7/20/2008 3:24:49 PM  |  status: Live  

How can Ni(OH)2 be seperated from Al(OH)3?

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How can Ni(OH)2 be seperated from Al(OH)3?
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posted by Ricky Wilkins on 7/20/2008 11:31:55 PM  |  status: Live
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   Al(OH)3 will precipitate form solution only in a fairly narrow pH range. Al(OH)3 will dissolve in strongly acidic and in strongly basic solutions; hence the use of the bufer solution. If Ni is present in the  solution, Ni(OH)2 will precipitate upon initial addition of a weak base, but the soluble complex ion  will be formed upon continued addition of base, but the soluble complex ion  will be formed upon continued addition of NH3.Hence we can seperate the Al(OH)2 based on the solubilith conditions.
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posted by CHEMNATION! on 7/22/2008 5:13:22 AM  |  status: Live
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In higher basic solution, Al(OH)3 reacts with hydroxide to form the soluble complex ion Al(OH)4-.  Ni(OH)2 is quite stable in strong base and remains as a solid.
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