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Homework Help: Net Ionic Equations

  1. Nov 6, 2005 #1
    Write the correct chem formula, predict products, and write the molecular, total, and net ionic equations.


    1) barium chlorate + lithium carbonate
    Ba(ClO3)2 (s) + Li2CO3 (aq) --> BaCO3 (s) + 2LiClO3 (aq)
    Ba(ClO3)2 (s) + 2Li(+) + CO3 (2-) --> BaCO3 + 2Li(+) + 2ClO3-
    Ba(ClO3)2 (s) + CO3 (2-) (aq) --> BaCO3 (s) + 2ClO3-(aq) ?


    2) sodium hydroxide + aluminum SULFATE
    6NaOH (aq) + Al2(SO4)2 (aq) --> 3NaSO4 (aq) + 2Al(OH)2 (s)
    6Na(+) + 6OH- + 2Al (3+) + 3SO4 (2-) --> 6Na+ + 3SO4 (2-) + 2Al(OH)3 (s)
    6OH- (aq) + 2Al (3+) (aq) --> 2Al(OH)3 (s) ?

    3) sodium carbonate + hydroiodic acid
    Na2CO3 (aq) + 2HI (aq) --> 2NaI (aq) + H2CO3 (s)
    2Na (+) + CO3 (2-) + 2H+ + 2I- --> 2Na(+) + H2CO3 (s)
    CO3 (2-) (aq) + 2H+ (aq) --> H2CO3 (s) ?


    4) barium hydroxide + hydrobromic acid
    Ba(OH)2 (aq) + 2HBr (aq) --> Ba(Br)2 (aq) + 2H2O (l)
    Ba (2+) + 2OH- + 2H+ + 2Br- --> Ba (2+) + 2Br- + H2O
    2OH- (aq) + 2H+ (aq) --> 2H2O (l)?
    Thanks.
     
    Last edited: Nov 6, 2005
  2. jcsd
  3. Nov 6, 2005 #2
    #1 is fine
    #2 you are showing the reaction between aluminum sulfate and sodium hydroxide; not aluminum bromide

    Al2SO4 is the wrong formula for aluminum sulfate.

    #3 carbonic acid is unstable and breaks up into CO2 and H2O (H2CO3 --> H2O + CO2)

    #4 looks good, but Ba(Br)2 should be written as BaBr2 and you can divide your net ionic equation by 2 (by the way all acid-base neutralization equations will have the same net ionic equation of OH- + H+ --> H2O
     
  4. Nov 6, 2005 #3
    3) CO3 (2-) (aq) + 2H+ (aq) --> H2O (l) + CO2 (g)
    2) mistyped question (which explains why I missed Al2(SO4)3 --I'm sorry!)
    sodium hydroxide + aluminum sulfate
    6OH- (aq) + 2Al (3+) (aq) --> 2Al(OH)3 (s) ?
     
    Last edited: Nov 6, 2005
  5. Nov 6, 2005 #4
    Can someone check to see if I wrote the equations correctly?


    A. magnesium metal + sulfuric acid

    Mg (s) + H2SO4 (aq) --> MgSO4 (aq) + H2 (g)
    Mg (s) + 2H+ (aq) + SO4 (2-) (aq) --> Mg (2+) (aq) + H2 (g)
    Mg(s) + 2H+ (aq) --> Mg (2+) (aq) + H2 (g)

    B. lead (II) nitrate + hydrochloric acid

    Pb(NO3)2 (aq) + 2HCl (aq) --> PbCl2 (s) + 2HNO3 (aq)
    Pb (2+) (aq) + 2NO3- (aq) + 2H+ (aq) + 2Cl- (aq) --> PbCl2 (s) + 2H+ (aq) + 2NO3 - (aq)
    Pb (2+) (aq) + 2Cl- (aq) --> PbCl2 (s)

    Thanks again.
     
  6. Nov 6, 2005 #5
    Your correction to the aluminum sulfate looks fine.

    A) "Mg (s) + 2H+ (aq) + SO4 (2-) (aq) --> Mg (2+) (aq) + H2 (g)"
    Forgot sulfate ion on right side but net ionic is fine.

    B) Looks good.
     
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