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On addition of aq. NaOH to an aq. solution of salt R, a white ppt. is obtained, soluble in an excess of the hydroxide. A white ppt. is also obtained when R is treated with aq NH3, but it is insoluble in excess of it. Identify "R"??

On addition of aq. NaOH to an aq. solution of salt R, a white ppt. is obtained, soluble in an excess of the hydroxide. A white ppt. is also obtained when R is treated with aq NH3, but it is insoluble in excess of it. Identify "R"??

Grade:

1 Answers

Aman Bansal
592 Points
10 years ago

dear student,

The salt "R" will be a zinc salt , 

Following rzns will take place...

zinc ion: Zn2+(aq) + 2OH-(aq) ==> Zn(OH)2(s) a white precipitate formed

of zinc hydroxide, which dissolves in both excess (i) sodium hydroxide or (ii) ammonia to give a clear colourless solution:

(i) Zn(OH)2(s) + 2OH-(aq) ==> [Zn(OH)4]2-(aq)  (amphoteric behaviour because zinc hydroxide dissolves in acids too).

(ii) Zn(OH)2(s) + 4NH3(aq) ==> [Zn(NH3)4]2+(aq)  + 2OH-(aq) (soluble complex ion formation)

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