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Polyatomic Ions. One more to throw in the mix. What are PA ions?. The are charged molecules Or in other words… They are ions that are made up of more than one type of atom Regular ion: [Na] + Example Polyatomic ion: [NH 4 ] + They have an electric charge They cannot exist on their own.

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Polyatomic ions

Polyatomic Ions

One more to throw in the mix


What are pa ions
What are PA ions?

  • The are charged molecules

    Or in other words…

  • They are ions that are made up of more than one type of atom

    Regular ion: [Na]+

    Example

    Polyatomic ion: [NH4]+

  • They have an electric charge

  • They cannot exist on their own


Who cares
Who cares?

  • Polyatomic ions are the basic building blocks of so many ionic compounds

  • Learning about them and becoming familiar with their names, formulas and charges will make life more efficient and easier when dealing with Chemistry


Memorization
Memorization?

  • No! That’d be silly. But look at them often enough to become familiar with them

  • Look on pg. 192 in your text to see a list of common PA ions

    Examples:

  • Ammonium (NH4)+

    • When reacted with Cl- it become ammonium chloride, a flavouring agent in liquorish

  • Chlorate (ClO3)-

    • When reacted with Na+ it become sodium chlorate, a herbicide used in controlling the growth of plants, such as morning glories and bamboo


How to write the formula for a compound with a pa ion in it
How to write the formula for a compound with a PA ion in it

Example: manganese (III) chlorate

  • Figure out what these two ions are and what their charges are

    • manganese (III) is Mn3+

    • chlorate is ClO3-

  • Figure out how many you need of each so that the positive charge and negative charge balance out to zero

    • Mn has a + 3 charge so 1 Mn = +3

    • ClO3 has a -1 charge and 3 ClO3 = -3

      0

  • List the two ions in the order they are named. Put brackets around any ions where there are more than one of them

    • Mn(ClO3)

  • Indicate how many ions are present in a subscript, right after the brackets

    • Mn(ClO3)3


Now you try
Now you try!

Example: ammonium sulfate

  • Figure out what the two ions are and what their charges are

  • Figure out how many of each ion you need to balance the positive and negative ions out to zero

  • List the two ions in the order that they are named. Put brackets around any ions where there are more than one of them involved

  • Indicate how many of each ion are present in the compound as a subscript right beside the ion (just outside of the brackets)

  • Bam!


Writing the name for a compound with a pa ion in it
Writing the name for a compound with a PA ion in it

  • Figure out what the two ions are – write out their names and charges

    • If they are both PA ions, then list them in the order they appear in the formula (positive ion first, negative ion second)

    • If the positive ion is a multivalent ion, then figure out what charge is being used and indicate it with roman numerals

    • If the negative ion is a simple non-metal, be sure to change the suffix to “ide”


Practice
Practice!

  • Flip your text books open to page 193

  • Work with your table partner – one partner does a, c, e, etc. the other partner does b, d, f, etc.

  • When you finished, check your answers with each other first, then with the back of the text book.

  • Ask for help/clarification if you need it… you have a quiz on Thursday that includes this!


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