Na
Al
K
NO3
H
Cl
NH4
NO3
Na
OH
NH4
NO3
H
Na
OH
H
OH
PO4
Cu
SO4
Mg
SO4
Cl
Mg
CO3
Mg
SO4
PO4
CH3COO
Al
NH4
Cl
May be used for educational purposes with acknowledgement © www.chemicalformula.org
Chemical Formula Key
Positive ions
Ammonium ion
Hydrogen ion
Potassium ion
Sodium ion
Copper ion
Magnesium ion
Aluminum ion
Formula
Combining Power
+
NH4
H+
K+
Na+
Cu2+
Mg2+
Al3+
1
1
1
1
2
2
3
Negative ions
Acetate ion
Chloride ion
Hydroxide ion
Nitrate ion
Carbonate ion
Sulfate ion
Phosphate ion
Formula
Combining Power
-
CH3COO
ClOHNO3CO32SO42PO43-
1
1
1
1
2
2
3
Determine the formula of the following compounds with the help of the cut-out model sheet.
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Chemical
Formula
copper carbonate
copper sulfate
copper chloride
potassium nitrate
potassium hydroxide
potassium chloride
aluminum phosphate
aluminum chloride
magnesium carbonate
magnesium sulfate
magnesium chloride
sodium carbonate
sodium phosphate
sodium sulfate
sodium nitrate
sodium hydroxide
No
17
18
19
20
Chemical
sodium chloride
ammonium nitrate
ammonium hydroxide
ammonium chloride
Formula
Brackets are need if the number of
polyatomic groups is greater than one.
21 aluminum sulfate
22 aluminum nitrate
23 aluminum hydroxide
24 copper hydroxide
25 copper nitrate
26 ammonium carbonate
27 ammonium phosphate
28 ammonium sulfate
29 magnesium nitrate
30 magnesium phosphate
No
31
Chemical
magnesium hydroxide
Formula
By convention organic groups like the acetate
ion are written first. The metal ion is written
last. This reflects the structural formula.
32 potassium acetate
33 ammonium acetate
34 sodium acetate
Match the hydrogen ions in the cut-out model
with the correct groups.
35 water
36 hydrochloric acid
37 nitric acid
38 sulfuric acid
39 carbonic acid
40 phosphoric acid
41 acetic acid
May be reproduced for educational purposes with acknowledgement. ©www.chemicalformula.org
Chemical Formula Key
Positive ions
Ammonium ion
Hydrogen ion
Potassium ion
Sodium ion
Copper ion
Magnesium ion
Aluminum ion
Formula
Combining Power
+
NH4
H+
K+
Na+
Cu2+
Mg2+
Al3+
Negative ions
Acetate ion
Chloride ion
Hydroxide ion
Nitrate ion
Carbonate ion
Sulfate ion
Phosphate ion
1
1
1
1
2
2
3
Formula
Combining Power
-
CH3COO
ClOHNO3CO32SO42PO43-
1
1
1
1
2
2
3
ANSWERS
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Chemical
copper carbonate
copper sulfate
copper chloride
potassium nitrate
potassium hydroxide
potassium chloride
aluminum phosphate
aluminum chloride
magnesium carbonate
magnesium sulfate
magnesium chloride
sodium carbonate
sodium phosphate
sodium sulfate
sodium nitrate
sodium hydroxide
Formula
CuCO3
CuSO4
CuCl2
KNO3
KOH
KCl
AlPO4
AlCl3
MgCO3
MgSO4
MgCl2
Na2CO3
Na3PO4
Na2SO4
NaNO3
NaOH
No
17
18
19
20
Chemical
sodium chloride
ammonium nitrate
ammonium hydroxide
ammonium chloride
Formula
NaCl
NH4NO3
NH4OH
NH4Cl
Brackets are need if the number of
polyatomic groups is greater than one.
21 aluminum sulfate
Al2(SO4)3
22 aluminum nitrate
Al(NO3)3
23 aluminum hydroxide
Al(OH)3
24 copper hydroxide
Cu(OH)2
25 copper nitrate
Cu(NO3)2
26 ammonium carbonate
(NH4)2CO3
27 ammonium phosphate (NH4)3PO4
28 ammonium sulfate
(NH4)2SO4
29 magnesium nitrate
Mg(NO3)2
30 magnesium phosphate Mg3(PO4)2
No
31
Chemical
magnesium hydroxide
Formula
Mg(OH)2
By convention organic groups like the acetate
ion are written first. The metal ion is written
last. This shows the structural formula.
32 potassium acetate
CH3COOK
33 ammonium acetate
CH3COONH4
34 sodium acetate
CH3COONa
Match the hydrogen ions in the cut-out model
with the correct groups.
35 water
H2O
36 hydrochloric acid
HCl
37 nitric acid
HNO3
38 sulfuric acid
H2SO4
39 carbonic acid
H2CO3
40 phosphoric acid
H3PO4
41 acetic acid
CH3COOH
May be reproduced for educational purposes with acknowledgement. ©www.chemicalformula.org