How do i balance chemical equations

how do i balance chemical equations

Steps To Balance Ionic Equations

  1. Separate the net ionic equation into the two half-reactions. This means identifying and separating the reaction into an oxidation half-reaction and a reduction half-reaction .
  • For one of the half-reactions, balance the atoms except for O and H. You want the same number of atoms of each element on each side of the equation.
  • Repeat this with the other half-reaction.
  • Add H2 O to balance the O atoms. Add H + to balance the H atoms. The atoms (mass) should balance out now.
  • Now balance charge. Add e - (electrons) to one side of each half-reaction to balance charge. You may need to multiply the electrons the the two half-reactions to get the charge to balance out. It's fine to change coefficients as long as you change them on both sides of the equation.
    1. Now, add the two half-reactions

      together. Inspect the final equation to make sure it is balanced. Electrons on both sides of the ionic equation must cancel out.

  • Double-check your work! Make sure there are equal numbers of each type of atom on both sides of the equation. Make sure the overall charge is the same on both sides of the ionic equation.
  • If the reaction takes place in a basic solution. add an equal number of OH - as you have H + ions. Do this for both sides of the equation and combine H + and OH - ions to form H2 O.

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    1. Be sure to indicate the state of each species. Indicate solid with (s), liquid for (l), gas with (g), and aqueous solution with (aq).
  • Remember, a balanced net ionic equation only describes chemical species that participate in the reaction. Drop additional substances from the equation.

    Source: chemistry.about.com

    Category: Forex

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