Week 5.docx - Written Assignment 5 Chemical Reactions in...

Written Assignment 5: Chemical Reactions in Solution
Answer all assigned questions and problems, and show all work.
1. Define electrolyte and nonelectrolyte and identify each of the following substances
as a strong electrolyte, weak electrolyte, or nonelectrolyte: (5 points)
a. H
2
O- Weak
b. KCl- Strong
c. HNO
3
– Strong
d. CH
3
COOH- Weak
e. C
12
H
22
O
11
– Nonelectrolyte
- Electrolyte – Substance that when dissolved in water the solution can conduct
electricity
- Nonelectrolyte- Substance can’t conduct electricity
(Reference: Chang 4.9)
2. Write ionic and net ionic equations for the following reactions: (8 points)
a. AgNO
3
+ Na
2
SO
4
b. BaCl
2
+ ZnSO
4
c. (NH
4
)
2
CO
3
+ CaCl
2
d. NaNO
3
+ KCl
(Reference: Chang 4.21)
3. With reference to Table 4.2, suggest one method by which you might separate (a) K
from Ag
+
, (b) Ba
2+
from Pb
2+
, (c) NH
4
+
from Ca
2+
, and (d) Ba
2+
from Cu
2+
. All cations
are assumed to be in aqueous solution, and the common anion is the nitrate ion. (8
points)
→
→
→
→
+
A) Add Cl to Ag and K to make BaCl insoluble
B) Add Cl to Ba and Pb to make PbCl
C) Add SO4 to Nh4 and Ca to make CaSo4
D) Add SO4 to Ba and Cu to make BaSO4
(Reference: Chang 4.24)
4. Give the oxidation number of the underlined atoms in the following molecules and
ions: (7 points)
1
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a. Cl F- -1
b. I F
7 -
+7
c. C H
4
- -4
d. C
2
H
2
- -1
e. C
2
H
4
- -2
f. K
2
Cr O
4
- +6
g. K
2
Cr
2
O
7
- +6
h. KMn O
4
- +7
i. NaHC O
3
- +6
j. O
2
– 0
k. NaI O
3
- +5
l. K
2
O - -2
m. P F
6-
- +5 ( I think that is a negative ion)
n. Au Cl
4-
- +3
(Reference: Chang 4.47)