Writing Chemical Formula Worksheet With Answer Key - Spes Unica Page 10

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Example 1 Potassium phosphate
1. K
(PO
)
4
1
3
2. K
(PO
)
4
3. K
(PO
)
3
4
1
4. (Not needed)
5. K
(PO
)
3
4
Note: Brackets are not needed if there is only one complex ion in
the formula so K
(PO
) could be written as K
PO
3
4
3
4
Example 2 Magnesium sulphate
1. Mg
(SO
)
4
2
2
2. Mg
(SO
)
4
3. Mg
(SO
)
2
4
2
4. Mg(SO
)
4
5. Mg (SO
) or MgSO
4
4
Example 3 Calcium nitrate
1. Ca
(NO
)
3
2
1
2. Ca
(NO
)
3
3. Ca
(NO
)
1
3
2
4. Ca (NO
)
3
2
5. Ca (NO
)
3
2
Example 4 Ammonium hydroxide
1. (NH
)
(OH)
4
1
1
2. (NH
)
(OH)
4
3. (NH
)
(OH)
4
1
1
4. (NH
) (OH)
4
5. (NH
) (OH) or NH
OH
4
4
10

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