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Homework Help: Finding balanced net ionic equation of reaction with three reactants

  1. May 17, 2012 #1
    1. The problem statement, all variables and given/known data

    Write a balanced net ionic equation for the following chemical reaction

    2. Relevant equations

    Cr[itex]^{3+}[/itex] + ___NH3 (aq) + ____H2O (l) → Cr(OH)3 (s) + ___NH4[itex]^{+}[/itex] (aq)

    3. The attempt at a solution

    The balanced molecular equation is

    Cr[itex]^{3+}[/itex] + 3 NH3 (aq) + 3 H2O (l) → Cr(OH)3 (s) + 3 NH4[itex]^{+}[/itex] (aq)

    I'm not sure what type of reaction this is. Consequently, I don't know how to go about finding the net ionic equation. I can write net ionic equations for precipitation reactions with only two reactants, those aren't hard, but I'm a bit lost on the type presented above.
    Last edited: May 17, 2012
  2. jcsd
  3. May 18, 2012 #2


    User Avatar

    Staff: Mentor

    Type of the reaction doesn't matter, there are simple rules to follow when writing net ionic equation. Actually there is one rule - remove all spectators.

    And that's the correct answer.

    Please note - it is better to not mix normal text and LaTeX for formatting. Instead of writing [noparse]Cr[itеx]^{3+}[/itеx][/noparse] (which yields Cr[itex]^{3+}[/itex]) write [noparse]Cr3+[/noparse] (which yields Cr3+).
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