Well go over the method of naming ionic compounds that have one
or more polyatomic ions.
Slide 2
Any time a formula has more than two elements in it, or more
than two capital letters,
Slide 3
it must contain at least one polyatomic ion. Any time a formula
has more than two elements in it, or more than two capital letters,
it must contain at least one polyatomic ion.
Slide 4
Lets consider the formula MgSO4, MgSO 4 Al(NO 3 ) 3 NH 4 ClO
3
Slide 5
It has 3 elements in it: magnesium, sulphur, and oxygen, so it
must contain a polyatomic ion. Al(NO 3 ) 3 NH 4 ClO 3 3 Elements
MgSO 4
Slide 6
The polyatomic ions that well be using in this course are
shaded on this table. If we are given a formula with more than 2
elements in it, we look on this table for any polyatomic ions that
are in the formula. Formulas and Charges of Common Ions
Slide 7
The formula were working with is MgSO4, Formulas and Charges of
Common Ions MgSO 4
Slide 8
SO4 in the formula (click) is from the polyatomic ion sulphate,
SO4 2 minus Formulas and Charges of Common Ions MgSO 4
Slide 9
Mg in the formula is from (click) the single metal ion Mg 2+
Formulas and Charges of Common Ions MgSO 4
Slide 10
So MgSO4 contains the polyatomic ion sulphate, SO4. Al(NO 3 ) 3
NH 4 ClO 3 Polyatomic Ion MgSO 4
Slide 11
Now well consider the formula Al, NO3 in brackets, 3 MgSO 4 NH
4 ClO 3 Al(NO 3 ) 3
Slide 12
This formula also contains 3 elements, (click) aluminum,
nitrogen, and oxygen. So it must have a polyatomic ion in it. MgSO
4 NH 4 ClO 3 Al(NO 3 ) 3 3 Elements
Slide 13
The formula were working with is Al(NO 3 ) 3 Formulas and
Charges of Common Ions Al(NO 3 ) 3
Slide 14
We see that NO3 in the formula (click) is from the polyatomic
ion nitrate, NO3 minus. Formulas and Charges of Common Ions Al(NO 3
) 3
Slide 15
And The Al in the formula Formulas and Charges of Common Ions
Al(NO 3 ) 3
Slide 16
Is from the single metal ion Al 3plus Formulas and Charges of
Common Ions Al(NO 3 ) 3
Slide 17
So Al(NO3)3 contains the polyatomic ion nitrate NO3 MgSO 4 NH 4
ClO 3 Al(NO 3 ) 3 Polyatomic Ion
Slide 18
We see that this formula contains 4 elements: (click) Nitrogen,
hydrogen, chlorine, and oxygen MgSO 4 NH 4 ClO 3 4 Elements
Slide 19
NH 4 ClO 3 The formula were working with is NH 4 ClO 3.
Formulas and Charges of Common Ions
Slide 20
NH 4 ClO 3 Looking on the table, we see that NH4 in the
formula, Formulas and Charges of Common Ions
Slide 21
NH 4 ClO 3 Comes from the positive polyatomic ion ammonium, NH4
plus Formulas and Charges of Common Ions
Slide 22
NH 4 ClO 3 And ClO3 in the formula Formulas and Charges of
Common Ions
Slide 23
NH 4 ClO 3 Comes from the negative polyatomic ion chlorate,
ClO3 minus Formulas and Charges of Common Ions
Slide 24
So the formula NH4ClO3 contains 2 polyatomic ions, (click) NH4
or ammonium, and ClO3, or chlorate. MgSO 4 NH 4 ClO 3 2 Polyatomic
Ions
Slide 25
Now that weve shown you how to find polyatomic ions in
formulas, lets look at the rules for naming compounds with
polyatomic ions. Rules for Naming Compounds with Polyatomic
Ions
Slide 26
The first rule is, the name of a polyatomic ion does not change
in any way when it is used in a compound name. Its name is the same
in a compound as it is on an ion table. Rules for Naming Compounds
with Polyatomic Ions 1.The name of a polyatomic ion does not change
when it is used in a compound name. 2.Single elements follow the
same naming rules as they do in other compounds.
Slide 27
The second rule is, single elements that are not in polyatomic
ions, follow the same rules as they do in other compounds. Rules
for Naming Compounds with Polyatomic Ions 1.The name of a
polyatomic ion does not change when it is used in a compound name.
2.Single elements follow the same naming rules as they do in other
compounds.
Slide 28
The best way to learn how to name compounds with polyatomic
ions, is to see several examples. Here, were asked to name the
compound NH 4 Br Name the compound with the formula NH 4 Br
Slide 29
We see that NH4Br has 3 elements (click) nitrogen, hydrogen,
and bromine. Therefore, it must contain a polyatomic ion. NH 4 Br 3
Elements Name the compound with the formula NH 4 Br
Slide 30
NH 4 Br Looking on the table, we see that NH4 in the formula,
Name the compound with the formula NH 4 Br
Slide 31
NH 4 Br Is from the polyatomic ion ammonium, NH4 plus. Name the
compound with the formula NH 4 Br
Slide 32
Names of polyatomic ions dont change when they are part of a
compound name, so the first part of the name (click), is ammonium.
NH 4 Br ammonium bromide Name the compound with the formula NH 4
Br
Slide 33
The formula ends with the single element Br NH 4 Br ammonium
bromide ine Name the compound with the formula NH 4 Br
Slide 34
Which the periodic table tells us is bromine. NH 4 Br ammonium
bromide ine Name the compound with the formula NH 4 Br
Slide 35
So well note down bromine here. NH 4 Br ammonium bromide ine
Name the compound with the formula NH 4 Br
Slide 36
But for a non-metal element at the end of a formula, the name
must be changed to end in ide. Name the compound with the formula
NH 4 Br NH 4 Br ammonium bromide ine For a non-metal at the end of
a formula, the name ends in ide
Slide 37
So we replace the ine with ide Name the compound with the
formula NH 4 Br NH 4 Br ammonium bromide ine ide
Slide 38
And were left with the name bromide. Name the compound with the
formula NH 4 Br NH 4 Br ammonium bromide ide
Slide 39
Alternately, we can find Br minus on the ion table, and we see
that its name is bromide, so if a non-metal ion is on our ion
table, we can just copy the name directly from there. Name the
compound with the formula NH 4 Br NH 4 Br ammonium bromide ide On
the ion table
Slide 40
So the final answer is (click) the name of this compound is
ammonium bromide Name the compound with the formula NH 4 Br NH 4 Br
ammonium bromide ide
