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Thread: Polyatomic Ions

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    Polyatomic Ions

    My teacher told me that we need to memorise Polyatomic Ions for the HSC, so my question was; how many of them do we need to memorise? Usually, people give a select few (maybe 10-15) but those vary from different sources, so how many and which ones should I try and memorise?

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    Junior Member Sp3ctre's Avatar
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    Re: Polyatomic Ions

    The main ones I can think of right now that you need to know are hydroxide, nitrate, carbonate, sulfate, phosphate and ammonium. Someone might need to add to this list if I’ve missed something
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    New Member Karldahemster's Avatar
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    Re: Polyatomic Ions

    Quote Originally Posted by _Anonymous View Post
    My teacher told me that we need to memorise Polyatomic Ions for the HSC, so my question was; how many of them do we need to memorise? Usually, people give a select few (maybe 10-15) but those vary from different sources, so how many and which ones should I try and memorise?
    You're better off learning all of them otherwise you might get a curveball questiom involving an ion you don't know.
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    Re: Polyatomic Ions

    Quote Originally Posted by Karldahemster View Post
    You're better off learning all of them otherwise you might get a curveball questiom involving an ion you don't know.
    +1

    There are tips to memorize them:
    See HERE
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    Senior Member jazz519's Avatar
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    Re: Polyatomic Ions

    Quote Originally Posted by Karldahemster View Post
    You're better off learning all of them otherwise you might get a curveball questiom involving an ion you don't know.
    For those even if you forgot what it was, you can always figure out the charge by using lewis dot structures. It does take a few minutes, but is best choice to use if you don't know
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    Re: Polyatomic Ions

    Quote Originally Posted by Karldahemster View Post
    You're better off learning all of them otherwise you might get a curveball questiom involving an ion you don't know.
    People say there are an indefinite amount of Polyatomic ions, so it'd be impossible to remember them all. Should I just remember the common ones like; Carbonate, Chromite, Hypochlorite, Nitrate, Nitrite, Permanganate, Phosphate, Phosphite, Sulfate and Sulfite? Will that suffice or are there more I should remember?

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    Senior Member jazz519's Avatar
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    Re: Polyatomic Ions

    Quote Originally Posted by _Anonymous View Post
    People say there are an indefinite amount of Polyatomic ions, so it'd be impossible to remember them all. Should I just remember the common ones like; Carbonate, Chromite, Hypochlorite, Nitrate, Nitrite, Permanganate, Phosphate, Phosphite, Sulfate and Sulfite? Will that suffice or are there more I should remember?
    yeah remembering the common ones such as those you listed above is suffice.
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