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Forms a white precipitate with NaOH but not with NH3. Q: Give the correct formula of...

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spock7 | Student, Undergraduate | (Level 1) Honors

Posted August 16, 2012 at 12:37 PM via web

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Forms a white precipitate with NaOH but not with NH3.

Q: Give the correct formula of the ion that shows the following results

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llltkl | College Teacher | (Level 3) Valedictorian

Posted August 17, 2012 at 5:04 AM (Answer #1)

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The ion that forms a white precipitate with NaOH but not with NH3 is Ag+ ion. It forms a white ppt of AgOH upon addition of aqueous solution of NaOH. Upon addition of aqueous NH3, initially it forms a similar whitish precipitate, but when added in slight excess, a soluble complex of the formula Ag(NH3)2OH is formed resulting in a clear solution. The entire process happens so quickly that one is tempted to believe that it did not form any precipitate whatsoever. Hence silver ion (Ag+) should be the correct answer for this question.

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