Which reagent, NaOH or NH3, will enable you to precipitate the first-named ion f
ID: 704353 • Letter: W
Question
Which reagent, NaOH or NH3, will enable you to precipitate the first-named ion from a solution containing each of the following pairs of ions, leaving the second ion in solution? Give also the formula of the precipitate and the exact formula of the other ion in solution. Determine which ions form hydroxide precipitates or hydroxide complexes, and ammonia complexes.
(a) Al3+, Zn2+ (reagent, precipitate, ion insolution for all )
(b) Cu2+, Pb2+
(c) Pb2+, Cu2+
(d) Fe3+, Al3+
(e) Ni2+, Sn2+
(f) Sn2+, Ni2+
(g) Mg2+, Ag+
Explanation / Answer
(A) NaOH in excess , Al(OH)3 white precipitate , [Zn(OH)4]2-
(B) NaOH in excess , Cu(OH)2 blue precipitate , [Pb(OH)4]2-
(C) Ammonia solution in excess , Pb(OH)2 white precipitate , [Cu(OH)4]2+
(D) NaOH in excess , Fe(OH)3 reddish brown precipitate , [Al(OH)4]-
(E) NaOH in excess , Ni(OH)2 green precipitate , [Sn(OH)4]2-
(F) Ammonia solution in excess , Sn(NH3)2 , [Ni(NH3)6]2+
(G) Ammonia solution in excess , Mg(OH)2 white precipitate , [Ag(NH)3]+
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