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Topic: Writing molecular equations and net ionic equations (check)  (Read 29843 times)

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Offline Hemidol

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Writing molecular equations and net ionic equations (check)
« on: October 09, 2009, 11:53:04 PM »
(a) Write balanced molecular equations for the following potential precipitation reactions. Indicate
the states of reactants and products [(aq) or (s)].
(b) In those cases where a precipitate forms, write the net ionic equation. If there is no reaction, state
"No reaction."
(i) Na2S (aq) + Pb(NO3)2 (aq)  (ii) FeSO4 (aq) + Na3PO4 (aq)
(iii) MgCl2 (aq) + Pb(NO3)2 (aq)  (iv) K2SO4 (aq) + Ni(NO3)2 (aq) 


Here is my work for part a:

(i) Na2S(aq) + Pb(NO3)2(aq) -> 2 NaNO3(aq) + PbS(s)
(ii) 3 FeSO4(aq) + 2 Na3PO4(aq) -> Fe3(PO4)2(s) + 3 Na2SO4(aq)
(iii) MgCl2(aq) + Pb(NO3)2(aq) -> PbCl2(s) + Mg(NO3)2(aq)
(iv) K2SO4(aq) + Ni(NO3)2(aq) -> NiSO4(s) + 2 KNO3(aq)

Here is my work for part b:

(i) Pb2+(aq) + S2-(aq) -> PbS(s)
(ii) 3 Fe2+(aq) + 2 PO42-(aq) -> Fe3(PO4)2(s)
(iii) Pb2+(aq) + 2 Cl- -> PbCl2(s)
(iv) Ni2+(aq) + SO42-(aq) -> NiSO4(s)

How do these look? Any mistakes?

Offline plankk

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Re: Writing molecular equations and net ionic equations (check)
« Reply #1 on: October 10, 2009, 12:44:40 AM »
First three are correct. About fourth? Look for solubility of NiSO4

Offline Hemidol

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Re: Writing molecular equations and net ionic equations (check)
« Reply #2 on: October 10, 2009, 12:55:52 AM »
First three are correct. About fourth? Look for solubility of NiSO4
Ah, it's soluble. Nice find!

(iv) K2SO4(aq) + Ni(NO3)2(aq) -> NiSO4(aq) + 2 KNO3(aq)

Does that mean the net ionic equation must change to
(iv) Ni2+(aq) + SO42-(aq) -> NiSO4(aq)
Or should I just write "No reaction" (this is where my hunch is) :P

Offline plankk

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Re: Writing molecular equations and net ionic equations (check)
« Reply #3 on: October 10, 2009, 01:16:36 AM »
You should write "No reaction", because reaction doesn't occur. You dissolve only your salt.

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