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Electrochemistry
Short Answer Type
271.
The conductivity of 0.1 M KCl solution at 298 K is 0.0129 s cm
–1
. The resistance of this solution in a conductivity cell is found to be 58 ohms. What is the cell constant of the cell? The 0.1 M AgNO
3
solution at 298 K in the same conductivity cell offered a resistance of 60.5 ohms. What is the conductivity of 0.1 M AgNO
3
solution?
176 Views
272.
Resistance of a conductivity cell filled with 0.1 M KCl solution is 100 £2. If the resistance of the same cell when filled with 0.02 M KCl solution is 520 Ω. Calculate the conductivity and molar conductivity of 0.02 M KC1 solution. The conductivity of 0.1 M KCl at 298 K is 0.0129 s cm
–1
.
608 Views
273.
The electrical resistance of a column of 0.05 M NaOH solution of diameter 1 cm and length 50 cm is 5.55 x 10
3
ohm. Calculate its resistivity, conductivity and molar conductivity.
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274.
250 cm
3
solution containing 1 g of Ca(NO
3
)
2
in conductivity cell offered a resistance of 48 ohms. The cell constant of conductivity of the solution is 0.56 cm
-1
. Find the molar conductivity.
Ca
n
(
NO
3
)
2
=
1
g
164
g
mol
-
1
=
0
.
0061
mol
V
=
250
cm
3
=
0
.
250
L
∴
M
=
n
V
=
0
.
0061
0
.
250
=
0
.
0244
M
K
=
Cell
constant
Resistance
=
0
.
56
48
=
1
.
167
×
10
-
2
ohm
-
1
cm
-
1
∧
m
=
10
3
K
M
=
10
3
×
1
.
167
×
10
-
2
0
.
0244
∧
m
=
478
.
28
s
cm
2
mol
-
1
.
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275.
The conductivity of 0.00241 M acetic acid is 7.896 x 10
–5
s cm
–1
. Calculate its molar conductivity and if Λ°
m
for acetic acid is 390.5 s cm
2
mol
–1
, what is its dissociation constant?
157 Views
276.
Λ°
m
for NaCl, HCl and CH
3
COONa are 126.4, 425.9 and 91.0 s cm
2
mol
–1
respectively.
Calculate Λ° for HAC.
261 Views
277.
The specific conductance of a saturated solution of AgCl in water is 1.826 x 10
–6
ohm
–1
cm
–1
at 25°C. Calculate its solubility in water at 25°C. [Given Λ
∞
m
(Ag
+
) = 61.92 ohm
–1
cm
2
mol
–1
and Λ
∞
m
(CI
–
) = 76.34 ohm
–1
cm
2
mol
–1
]
1356 Views
278.
Calculate the molar conductance at infinite dilution of ethanoic acid from the following data:
Λ°
m
(HCl) = 425.9 s cm
2
mol
–1
Λ°
m
(CH
3
COONa) = 91.0s cm
2
mol
–1
Λ°
m
(NaCl) = 126.4 s cm
2
mol
–1
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Long Answer Type
279.
Draw curves to show how the molar conductance of strong electrolytes varies with dilution.
458 Views
Short Answer Type
280.
The molar conductivity of KCl solutions at different concentration at 298 K are given below:
C/mol L
–1
Λ/s cm
2
mol
–1
0.000198
0.000309
0.000521
0.000989
148.61
148.29
147.81
147.09
Show that a plot between A and C
1/2
is a straight line. Determine the values of Λ° and Λ
for KCl.
355 Views
27
28
29
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