Question

Questions 1. Consider the reaction of lead nitrate with sodium sulfate a) Complete and balance the molecular equation for this reaction. Include physical states. Pb(NO3)2 (aq) + Na2SO4(aq) → b) Give the complete ionic equation with correct coefficients, charges and physical states. c) Give the net ionic equation d) What evidence did you observe for this reaction? 2. Consider the reaction of aqueous copper (II) nitrate with aqueous sodium carbonate. a) Give the balanced molecular equation with correct physical states. b) What color is the precipitate? 3. Chemistry student Sally's unknown only contained one cation: either Ba?'. Pb?. or Fe. a) When Sally reacted her unknown sample with Na:CO, a white precipitate was observed. What cations could be present? b) What other test(s) should Sally perform to determine what cation was present in the unknown?

Answer 1

1)

a) Pb(NO3)2 (aq) + Na2SO4(aq) ---------------> PbSO4(s) + 2 NaNO3(aq)

b) Pb2+(aq) + 2NO3-(aq) + 2Na+(aq) + SO42-(aq)---------------> PbSO4(s) +2Na+(aq) + 2NO3-(aq)

c) Pb2+(aq) + SO42-(aq)---------------> PbSO4(s)

d) a white color solid is formed this is the evidence

2)

a) Cu(NO3)2(aq) + Na2CO3(aq) -------------------> CuCO3(s) + 2NaNO3(aq)

b) blue color

3)

a) Ba2+ and Pb2+ will be precipitated

b) Fe3+ cation can be identified by KSCN . forms precipitate orange colour.