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Homework Help: Net Ionic Equations Please help me out!

  1. Oct 21, 2006 #1
    Net Ionic Equations!! Please help me out!

    i'm having a hard time with writing net inoic equations and here are some sample problems with the answers I came up with.

    Please look over them and if somethings wrong, please correct the errors teach me how to fix it.

    1. A strip of copper is immersed in dilute nitric acid

    Cu + HNO3 -> Cu(NO3)2

    2. Excess concentrated ammonia solution is added to a suspension of silver chloride.

    Ag+ + OH- -> AgOH

    3. Solution of tri-potassium phosphate and zinc nitrate are mixed

    3Zn+ + (PO4)^-3 -> Zn3PO4

    4. Concentrated hydrochloric acid is added to solid manganese (II) sulfide.
    Mn^+2 + Cl2- -> MnCl2

    and the rest of them below, I had no clue on how to even start

    1. Potassium permanganate solution is added to an acidic solution of hydrogen peroxide

    I got KMnO4 + H2O2 -> KMnO4 + H + O2^-2
    but i hit the wall right here...
    I'm guessing that the product is HMnO4 but i'm not confident at all.

    2. Excess chlorine gas is passed over hot iron filings

    Cl2 + Fe^2+ ???????? sorry..but i couldnt figure this one out either

    3. Water is added to a sample of solid magnesium nitride

    4. Excess sulfur dioxide gas is bubbled thru a dilute solution of potassium hydroxide

    p.s. thank you so much for reading this. But if you have an extra time, would you give some tips on writing an ionic equations? or list some most common mistakes that students make when they first learn this?
  2. jcsd
  3. Oct 21, 2006 #2
    I won't look over it, but I will say this:

    Net ionic equations are equations stripped of spectator ions. Meaning any ion that does react into something different than from what it started out into (water, precipitate, redox), then it is not put into your equation.

    My guess is that you are, like me, only in the beginning stages of Chem, so you are only going to run into instances of precipitates, redox reactions, compound ions, and the creation of water (nuetralization and combustion are the only two big reactions that create water from what I've learned so far).

    If you are having problems, just write out the reaction. Then re-write the reaction describing it in ionic form. Then re-write it again taking out any ion that has not changed from the reactant to product stages.
  4. Oct 21, 2006 #3
    You allready post this once...
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