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chemistry

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why is this statement false?
"when an ionic compound dissolves in water an equal number of positive and negative ions is created."

  • chemistry -

    It is true than an equal number of positive and negative CHARGES are formed but that isn't the same as the number of positive and negative ions. For example,
    NaCl ==> Na^+ + Cl^-.
    1 mole NaCl dissociates, 1 mole Na^+ and 1 mole Cl^- are formed AND 1 mole of + and 1 mole of - negative charges are formed. BUT, when dissociates as in
    MgCl2 --> Mg^2+ + 2Cl^-
    then you see that we have 1 mole of 2+ charges and 2 moles of 1- charges so the charges are equal; however, we have 1 mole Mg^2+ and 2 moles Cl^-. Again, the charges are equal but the number of + and - ions are not the same.

  • chemistry -

    so then how would you make the statement true?

  • chemistry -

    Read my post again. I told you twice how to make it true.

  • chemistry -

    oh sorrry.....i got it.
    when an ionic compound dissolves in water an equal number of positive and negative charges are created.

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