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surya pratap singh Grade:
        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"??

6 years ago

Answers : (1)

Aman Bansal
592 Points
										

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)


 BEST OF LUCK..!!!!


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AMAN BANSAL                



6 years ago
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