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Net Ionic Equations

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browneyedbella:
just to see if I'm getting the hang of things...

cobalt sulfate and lithium sulfide

Co8++SO42- + Li++S2-
CoSO42- + Li2S  :rarrow: Li2S




barium bromide and potassium chromate
Ba2+Br + K+Cr6+O42-
BaBr2 + K2CrO4  :rarrow: BaK + CrO4



magnesium hydroxide and nitrous acid
3 Mg(OH)2 + 2 HNO3  :rarrow: MgH + OH2


??

browneyedbella:
please see original post for my answers.

corrections would be great.

also. i included the kind of reaction at the bottom. if its wrong, please correct and/or tell me why?

thanks so much!

browneyedbella:
So my professor gave out a sheet of net ionic equations to do. And needless to say I'm pretty lost. what I have typed under the number is as far as i get!!! PLEASE HELP. seriously, anything would be great.

Write balanced net ionic equations for any of the reactions that occur when aqueous solutions of the following compounds are mixed. If there is no reaction, give NR. Also - tell what type of reaction is occurring: precipitation, acid (base or oxidation-reduction)

1. chromium metal and hydroiodic acid.
I'm pretty sure this one has NR.

2. barium bromide and potassium chromate.
BaBr2 + K2CrO4 :rarrow: BaK + CrO4

3. magnesium hydroxide and nitrous acid.
Mg(OH)2 + HNO2  :rarrow: MgH + OH2
precipitation

4. cobalt sulfate and lithium sulfide.
CoSO42- + Li2S  :rarrow: Li2S

5. mercury (II) nitrate and ammonium iodide.
Hg(NO3)2 + NH4I  :rarrow: Hg2I

6. silver acetate and aluminum sulfate.
AgC2H3O2 + Al2(SO4)3  :rarrow: AgAl2

7. nickel (II) bromide and potassium phosphate.
NiBr + KH2PO4  :rarrow: NiH2 + KPO4

8. calcium carbonate and nitric acid
CaCO3 + HNO3  :rarrow: CaCO3 + H

9. sodium hydroxide and copper (II) sulfate
NaOH + Cu(SO)4   :rarrow: NR

10. calcium chloride and cadmium metal
CaCl2 + Cd  :rarrow: CaCd
precipitation

11. ammonia and perbromic acid.
NH3 + HBrO4  :rarrow: NH4 + BrO4
oxidation reduction

12. mercury metal and lead nitrate.
Hg + Pb(NO3)2  :rarrow: HgPb2
precipitation

13. zinc sulfite and sulfuric acid.
ZnSO2 + H2SO4  :rarrow: H2O + ZnSO4
acid base reaction

14. magnesium metal and tin (IV) chloride.
Mg2+ + SnCl4  :rarrow: Mg4Cl2 + Sn



NOTE: I'm not sure if they are all balanced. And I'm not sure what state they are in (Aq, liq, gas). If you catch any mistake (which there are probably alot) please *delete me*

Again, I'm not good at this at all. Any help would be great!

Borek:

--- Quote from: browneyedbella on October 07, 2008, 02:37:11 AM ---1. chromium metal and hydroiodic acid.
I'm pretty sure this one has NR.
--- End quote ---

Metal in very strong acid.


--- Quote ---2. barium bromide and potassium chromate.
BaBr2 + K2CrO4 :rarrow: BaK + CrO4
--- End quote ---

You are mixing two salts. Check solubility of barium chromate. Besides, you can't combine any ion with any ion - ionic salts have a cation and an anion, not two cations. And where is bromide on the right?


--- Quote ---3. magnesium hydroxide and nitrous acid.
Mg(OH)2 + HNO2  :rarrow: MgH + OH2
precipitation
--- End quote ---

Again, you are combining wrong ions. You have a base and an acid.


--- Quote ---4. cobalt sulfate and lithium sulfide.
CoSO42- + Li2S  :rarrow: Li2S
--- End quote ---

Half of your reactants disappeared. Check solubility rules.

You repeat similar mistakes now and again, so analyze these and redo the rest.

AWK:

--- Quote from: browneyedbella on October 07, 2008, 01:49:45 AM ---just to see if I'm getting the hang of things...

cobalt sulfate and lithium sulfide

Co8++SO42- + Li++S2-
CoSO42- + Li2S  :rarrow: Li2S




barium bromide and potassium chromate
Ba2+Br + K+Cr6+O42-
BaBr2 + K2CrO4  :rarrow: BaK + CrO4



magnesium hydroxide and nitrous acid
3 Mg(OH)2 + 2 HNO3  :rarrow: MgH + OH2


??

--- End quote ---
write down like this
Co2+(aq) + S2-(aq) = CoS(s)

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