Naming Compounds That Contain Polyatomic Ions Worksheet Page 3
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(continued)
2
d. Mn(OH)
Mn
manganese(II)
manganese(II)
2
two OH
hydroxide
hydroxide
e. Na
SO
two Na
sodium
sodium sulfite
2
3
2
SO
sulfite
3
Self-Check Exercise 4.6
Name each of the following compounds.
a. Ca(OH)
2
b. Na
PO
3
4
c. KMnO
4
d. (NH
)
Cr
O
4
2
2
7
e. Co(ClO
)
4
2
f. KClO
3
g. Cu(NO
)
2
2
Example 4.7 illustrates that when more than one polyatomic ion appears in
a chemical formula, parentheses are used to enclose the ion and a subscript
is written after the closing parenthesis. Other examples are (NH
)
SO
and
4
2
4
Fe
(PO
)
.
3
4
2
In naming chemical compounds, use the strategy summarized in Figure
4.2. If the compound being considered is binary, use the procedure summa-
rized in Figure 4.1. If the compound has more than two elements, ask your-
self whether it has any polyatomic ions. Use Table 4.4 to help you recognize
these ions until you have committed them to memory. If a polyatomic ion
is present, name the compound using procedures very similar to those for
naming binary ionic compounds.
Binary compound?
No
Yes
Use the strategy
Polyatomic ion
summarized
or ions present?
in Figure 4.1.
No
Yes
This is a compound
Name the compound
for which naming
using procedures similar
procedures have not yet
to those for naming
been considered.
binary ionic compounds.
Figure 4.2
Overall strategy for naming chemical compounds.
102
Chapter 4 Nomenclature
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