2.- Which of these choices is the correct net ionic eqn. forthe reaction that oc

Question

2.- Which of these choices is the correct net ionic eqn. forthe reaction that occurs when solutions of Pb(NO3)2 and NH4Br aremixed? a) Pb(NO3)2(aq) + 2NH4Br(aq)-------> NH4NO3(aq) +PbBr2(s) b) Pb2+(aq) + 2Br-(aq) --------->PbBr2(s) c) Pb2+(aq) + 2NO3-(aq)+ 2NH4+(aq) + 2Br-(aq)--------> 2NH4+(aq) +2NO3-(aq) + PbBr2(s) d) NH4+(aq) +NO3-(aq) ---------->2NH4NO3(s) e) No reaction occurs when the solutions are mixed. 2.- Which of these choices is the correct net ionic eqn. forthe reaction that occurs when solutions of Pb(NO3)2 and NH4Br aremixed? a) Pb(NO3)2(aq) + 2NH4Br(aq)-------> NH4NO3(aq) +PbBr2(s) b) Pb2+(aq) + 2Br-(aq) --------->PbBr2(s) c) Pb2+(aq) + 2NO3-(aq)+ 2NH4+(aq) + 2Br-(aq)--------> 2NH4+(aq) +2NO3-(aq) + PbBr2(s) d) NH4+(aq) +NO3-(aq) ---------->2NH4NO3(s) e) No reaction occurs when the solutions are mixed.

Explanation / Answer

b) nitrates are always soluble, ammonium compounds are soluble, butlead PbBr2 is not soluble lead nitrate is soluble, ammonium bromide is soluble, ammoniumnitrate is soluble. Pb2+ + 2NO3- +2NH4+   + 2Br- -------> 2NH4++ 2NO3-+ PbBr2(s) eliminate like species on both sides Pb2+(aq) + 2Br-(aq) --------->PbBr2(s)

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