3) AO (if no reaction occurs write NR) 1) t N02002, is 2) No 0 3) 4) In each cas

Question

3) AO (if no reaction occurs write NR) 1) t N02002, is 2) No 0 3) 4) In each case where the addition of Nazco, solution gave a different llna re- sult than the addition of (NHA)2003 solution (precipitate vs no precipitate) explain why the two sources of carbonate ion" gave different results. 3) When a NH2 solution was added to solutions of 34, cu? Zn and Ag in Experi Fe ments 4 and 5 a) Write the formulas of any precipitates which formed. Write the formulas of any ammine complexes which formed. For those ions which did both, state which happened first.

Explanation / Answer

1. Na2CO3 is strong base and releases co3 to give ppt, however the NH4CO3 is a buffer and do not completely release CO3 to form a ppt

2. Fe3+ +3NH3 +3H2O----> Fe(OH)3 +3NH4+
   Cu2+ + 2NH3 ----> [Cu(NH3)2]2+
   Zn2+ + 2NH3 ---> [Zn(NH3)2]2+
Ag + 2NH3 ----> [Ag(NH3)2]+

3. Amine complex is formed for Ag, Zn, Cu

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