Chapter 3 Section 3.5 Guideline #3 Tasks #7 & #8 Study Guide

†††††††††††††††††††††††††† Ternary Ionic Compounds 

†††††††††† †††††††InorganicCpdsFlowChart

1.      Inorganic Compounds are subdivided into three Categories:
a. Ionic* : Metallic (Cations) + Nonmetallic (anions) (ion smallest unit)
Molecular: Nonmetal-Nonmetal (molecule smallest unit)
Acids (aq): Hydrogen ions (Hydronium ions) + Nonmetallic ions (Cations)
††††††††††††††††††††††††† (in aqueous solution)

*(also called Salts, Minerals, and Body Electrolytes)

††††† 2. Ternary ionic means that there are three or more elements (ternary)
†††††††††† in the formula and the compound is made up of two ions (ionic):

††††††††††† least one of the ions (either the CATION or ANION or both)
††††††††††††††† is/are polyatomic ion(s) (See Polyatomic ion study guide)

††††††††††† b. Positive Charged Metallic ion (CATION): Metallic Cation is a
††††††††††††††† positively charged metallic atom as explained in Guideline 1 or

††††††††††† c.Positive Charged Polyatomic CATION is a group of two or more
†††††††††††††††† nonmetal atoms covalently bonded but the group has an overall
†††††††††††††††† charge positive charge.
††††††††††††††††††††††††† †††
Ammonium NH41+ and Hydronium H3O1+
†††††††††††††††† are the two Polyatomic Cations mostly used from Polyatomic ion
†††††††††††††††† list.

†††††††††††† d. Negative Charged Nonmetallic Ion (ANION) is group of two or
†††††††††††††††† more nonmetals atoms covalently bonded but the group has
†††††††††††††††† an overall negative charge. The majority of Polyatomic ions are
†††††††††††††††† Anions composed a nonmetal or transitional metal bonded to
†††††††††††††††† oxygen. All nonmetals (except fluorine), some transitional
†††††††††††††††† metals, and many metalloids bond with oxygen to make these
††††††††††††††† Anions. These ions are often called oxyanions. The Master list
††††††††††††††† has over 130 polyatomic Anions.

3. Look at the list of polyatomic ions below we will use when we
††††††††† write the Names or Formulas of make Ternary Ionic Compounds:††††††† ††

††† -ate Polyatomic ions with four oxygen atoms
†††† -ate Polyatomic ions with three oxygen atoms
†††† Polyatomic ions which also contain hydrogen
†††† -ide Polyatomic ions (and also Cyanate which is different)
†††† Positive Charged (Cation) Polyatomic Ions

4. The total charge on the Ternary ionic compound must add up to zero like the Binary Ionic Compounds (Guideline #1). Use the Least Common Multiple technique explained in Guideline #1 to balance the formula. To indicate more than one polyatomic ion group enclose the group in parenthesis and apply the subscript to the group.


5. For example, write the formula and charges of the ions, then balance using the LCM:
†††††††††††††††† Cation†††††††††††††††††††††††††††††††††† Anion


Magnesium phosphate††††† Ammonium Carbonate†† ††Calcium hypochorite

†† Mg2+††††††PO43-††††††††††††††††† NH41+††††† CO32-†††††††††† Ca2+††††† ClO1-

†††† The LCM is six †††††††††††††††††††The LCM is 2††††††††††††††††††† The LCM is two

††† Mg3(PO4)2†††††††††††††††††††††† (NH4)2CO3†††††††††† †††††††††††††Ca(ClO)2



Do Not Forget if the metallic element has more than one ionic state,

††††††††††† write a ROMAN NUMERAL after the elementís name in parenthesis

††††††††††† to indicate which charge state the metallic element is using to form the compound.


††††††† writingrulesRomannumeral





To complete Project #5 Task#7, you will write the names of 10 Ternary Ionic Compounds from the formula.( Do not forget to put the Roman numeral if the element has more than one ionic charge possible [Transitional metals])


Task #7: Ternary (IONIC) COMPOUND Names

To complete Project #5 Task#8, you will write the formulas of 10 Ternary Ionic Compounds from the name. (Do not forget the Roman numeral if the element has more than one ionic charge possible [most Transitional metals])


Task #8: Ternary (IONIC) COMPOUND Formulas


Sample Ternary Ionic Compound Names & Formulas Practice

Using a periodic chart write the names or formulas of the following compounds depending on whether the formula or name is given:
 1.†† Na2CO3†††††† __Sodium carbonate_______

 2.†† K2SO4†††††††††† __Potassium sulfate_______

 3.†† (NH4)3PO4††__Ammonium phosphate___

 4.†† Ca(ClO3)2†††† __Calcium chlorate________

 5.†† CuNO3†††††† †††††__Copper I Nitrate_________

  6.†† Aluminum Hydroxide††††††††† __Al(OH)3_____

 7.†† Ammonium carbonate††††††††† __(NH4)2CO3___

8.†† Sodium Hypochlorite††††††† ††††___NaClO_____

 9.†† Magnesium Nitrate†††††††††††††† ___Mg(NO3)2____

 10.Iron III sulfite†††††††††††††††††††††† ___Fe2(SO3)3___

Discover Polyatomic Ion Formula and Charges from Interactive Web Page:
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