SCH 4C
Naming Multi-Valent Ionic Compounds
Last time, we learned about simple ionic compounds. Complete the following table.
Ion symbol of
non-metallic
element
Name
Combining Elements
Ion symbol
of metallic
element
Ionic
Formula
Calcium and Phosphorous
Ca2+
P3-
Calcium Phosphide
Ca3P2
Magnesium and Oxygen
Beryllium and Sulfur
Sodium and Iodine
Lithium and Nitrogen
Barium and Chlorine
Multivalent metals can lose different numbers of electrons,
having more than one valence.
Example:
Fe3+ and
Fe2+
Charge Number
(Valence)
1
To avoid confusion when naming the compounds they form, we
identify the metal valence using a roman numeral in brackets:
2
Steps to Naming Multivalent compounds:
4
Step 1: ___________________________________________
5
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Roman Numeral
3
6
7
Step 2: ___________________________________________
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Step 3: ____________________________________________________________________________
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Step 4: ____________________________________________________________________________
Try the formula for titanium (IV) fluoride
Manganese (III) Sulfide
Ions:
Ions:
Charge:
Charge:
Balanced:
Balanced:
Formula:
Formula:
Now Try these:
a) Iron (II) oxide
b) Iron (III) oxide
c) Copper (II) nitride
d) Lead (IV) sulfide
Steps for Writing formulas for Multivalent compounds.
Step 1: ____________________________________________________________________________
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Step 2: ____________________________________________________________________________
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Step 3: ____________________________________________________________________________
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Step 4: ____________________________________________________________________________
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Step 5: ____________________________________________________________________________
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Step 6: ____________________________________________________________________________
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Try to write the name for FeI2:
Is there a multivalent metal?
What are its different ion forms?
What is the ratio of ions
What is the charge on the negative ion
Balance the positive and negative charges
Write the name using a roman numeral to say which
ion form of Iron is present
Try another, PbF4:
Is there a multivalent metal?
What are its different ion forms?
What is the ratio of ions
What is the charge on the negative ion
Balance the positive and negative charges
Write the name using a roman numeral to say which
ion form of Iron is present
Now Try with the Following Formulas:
CuCl2
CuSO4
Cu2O
CuO
1.
FeO
21.
Calcium hydroxide
2.
SnS2
22.
Chromium (III)
chloride
3.
PbSO4
23.
Chromium (II)
carbonate
4.
Cr 2 S 3
24.
Silver sulphate
5.
Cu(NO3)2
25.
Ammonium fluoride
6.
Fe 2 (SO 4 ) 3
26.
Iron (III)
dichromate
7.
SnF2
27.
Lead (II) sulphide
8.
HgSO4
28.
Copper (II)
permanganate
9.
Cu 3 (PO 4 ) 2
29.
Chromium (III)
sulphate
10.
Mn(MnO4)2
30.
Copper (II) fluoride
11.
Fe(OH)2
31.
Chromium (III)
hydrogen carbonate
12.
Pb(CrO4)2
32.
Iron (III) phosphate
13.
CuCl
33.
Sodium sulphide
14.
MnO2
34.
Lead (IV) chloride
15.
SnSO4
35.
Mercury (I) nitrate
16.
Fe(ClO3)2
36.
Chromium (II) oxide
17.
PbBr2
37.
18.
Cu(HS)2
38.
Calcium chromate
19.
Mn(CO3)2
39.
Barium
phosphate
20.
Pb(NO2)4
40.
Tin (IV) sulphate
Magnesium
nitrate