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    Balancing an Equation

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    Which is correctly balanced?
    A. H3PO4 + NaOH --> Na3PO4 + 3H2O
    B. 2SO2 + O2 --> 2SO3
    C. 2Na + 2H2O --> H2 + 2NaOH
    D. CS2 + 2H2 --> 2H2S + CH4

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    Solution Preview

    A. H3PO4 + NaOH --> Na3PO4 + 3H2O

    This is not balanced. We must place a 3 in front of the NaOH in order to balance out the Na, O and H on both sides. Thus

    H3PO4 + 3 NaOH --> Na3PO4 + 3H2O ...

    Solution Summary

    Balanced reactions must have the same number of atoms of elements on both sides of the reaction.