The Ionic Bond Worksheet Page 2
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1
2The Ionic Bond
19. What two names can be used for Ca(HCO
)
?
calcium hydrogen carbonate or calcium bicarbonate.
3
2
21. Predict the formulas of the vanadate and titanate ions.
Vanadium is a 5B and by analogy to the 5A’s, the vanadate ion should have a formula similar to phosphate
3-
ion. The vanadate ion is VO
.
4
Titanium is a 4B metal and is expect to be in the +4 oxidation state in an -ate ion. By analogy to the 4A ions
2-
.
carbonate and silicate, the titanate ion is predicted to be TiO
3
23. Consider the compound formed between atoms Y and Z.
a) What are the maximum and minimum oxidation states of Y?
Since Y must lose six electrons to empty its valence orbitals, its maximum oxidation state is +6. It must gain
two electrons to fill its valence shell so it minimum oxidation state is -2.
b) What are the maximum and minimum oxidation states of Z?
Z can lose five electrons and thus attain a +5 oxidation state. It requires three electrons to fill its valence
orbitals to become a -3.
c) What is the formula of the compound Y and Z in their maximum and minimum oxidation states?
Z is the more electronegative atom and is assigned its minimum oxidation state of -3. Y is less electronegative
and is assigned its +6 oxidation state. The formula is YZ
.
2
25. Write formulas for the following compounds:
a) gallium(III) oxide
Ga
O
2
3
b) strontium bromide
SrBr
2
c) zinc acetate
Zn(CH
COO)
or Zn(C
H
O
)
acetate ion is represented by either formula. The first
3
2
2
3
2
2
better indicates the structure of the ion, but both are common.
d) manganese(II) sulfide
MnS
27. Write formulas for the following ionic compounds:
a) sodium bicarbonate:
b) iron(II) hydrogensulfate:
NaHCO
Fe(HSO
)
3
4
2
c) calcium dihydrogenphosphate:
d) magnesium hydrogensulfite:
Ca(H
PO
)
Mg(HSO
)
2
4
2
3
2
29. How many moles of iron(III) oxide are present in a 5.00-g sample?
1 mol Fe
O
2
3
×
5.00 g Fe
O
= 0.0313 mol Fe
O
2
3
2
3
159.7 g Fe
O
2
3
31. A sample of calcium nitrate contains 0.025 mol of oxygen atoms. What is the mass of the sample?
1 mol Ca(NO
)
164 g Ca(NO
)
3
2
3
2
0.025 mol O ×
×
= 0.68 g Ca(NO
)
3
2
6 mol O
mol Ca(NO
)
3
2
33. How many moles of protons are required to convert all of the phosphate ions in 25.0 g of magnesium phosphate into
dihydrogen phosphate ions?
3-
1-
1+
1 mol Mg
(PO
)
2 mol PO
1 mol H
PO
2 mol H
3
4
2
4
2
4
1+
×
×
×
×
25.0 g Mg
(PO
)
=0.380 mol H
3
4
2
263 g Mg
(PO
)
1 mol Mg
(PO
)
3-
1-
1 mol PO
1 mol H
PO
3
4
2
3
4
2
4
2
4
How many moles of electrons must be removed to convert 7.5 g Zn to zinc ions?
35.
The Zn ion has a charge of +2, so 2 mol electrons must be removed for each mole of Zn
1 mol Zn
2 mol electrons
7.5 g Zn
×
×
= 0.23 mol electrons
65.4 g Zn
1 mol Zn
4-2
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