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    ilovecobyxo's Avatar
    ilovecobyxo Posts: 1, Reputation: 1
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    #1

    Feb 17, 2008, 05:37 PM
    Chemistry: Balancing Equations
    I don't understand how to do the equations when some of the elements are in parenthses


    BA(OH)2 + H3PO4 --> BA3(PO4)2 +H2O


    Fe(OH)3 --> Fe2O3 + H2O


    Zn(OH)2 + H3PO4 --> Zn3(PO4)2 + H2O


    Au + NaCN + H2O + O2 --> NaOH + NaAu(CN)2
    templelane's Avatar
    templelane Posts: 1,177, Reputation: 227
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    #2

    Feb 18, 2008, 11:16 AM
    It's like maths you multiply the brackets by the nuber next to it. So (PO4)2 would mean the compound contains two phosphate (PO4) groups. Are you all right with the rest? If you just write out all the atoms and cross them off as they balance on each side you can't really go wrong.
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