Making Ionic Compounds With Multiple Charges Worksheet Page 3
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2
3
4Make a mental note, how many positive and negative pieces were needed to achieve neutrality.
7. Next use a -2 ion piece and cause it to join with a +2 ion.
Make a mental note, how many positive and negative pieces were needed to achieve neutrality.
8. Finally use a -2 ion piece(s) and cause it to join with +3 ion piece(s).
Make a mental note, how many positive and negative pieces were needed to achieve neutrality.
Follow-up Questions:
Q8. In each case neutrality has to be accomplished. Write the formula for the generic compounds
2-
1+
2+
3+
using Y
, and X
,X
, and X
respectively. Think about how many positive and negative pieces
would be needed to achieve neutrality. THE POSITIVE ION IS STILL WRITTEN FIRST.
Q9. Complete the following table by writing the needed formula. THE POSITIVE ION IS
WRITTEN FIRST.
Divalent anion
1+
2+
3+
monovalent cation(X
)
divalent anion (X
)
trivalent anion (X
)
2- )
(Y
K 1+
Mg 2+
Al 3+
S 2-
O 2-
Q10. Complete the following table by writing the correct formula involving polyatomic ions (and
potentially the use of parentheses). THE POSITIVE ION IS ALWAYS WRITTEN FIRST.
1+
2+
3+
Divalent anion
monovalent cation(X
)
divalent anion (X
)
trivalent anion (X
)
2- )
(Y
NH 4 1+
Ca 2+
Sc 3+
CO 3 2-
SO 4 2-
Back to the Procedure:
9. Now use a +3 ion piece and cause it to join with -1 ion piece(s).
Think to remember how many positive and negative pieces were needed to achieve neutrality.
10. Next use a +2 ion piece and cause it to join with a -2 ion piece(s).
Make a mental note, how many positive and negative pieces were needed to achieve neutrality.
11. Finally use a +2 ion piece(s) and cause it to join with a -3 ion piece(s).
Make a mental note, how many positive and negative pieces were needed to achieve neutrality.
Follow-up Questions:
Q11. In each case neutrality has to be accomplished. Write the formula for three generic compounds
using X
3+
, and Y
1-
, Y
2-
, and Y
3-
respectively. Think about how many positive and negative pieces
would be needed to achieve neutrality
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