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Standard VI
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Calculation o...
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Calculation of kb of water
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Q.
Calculate the
p
H
of
0.1
M
N
H
4
C
l
solution in water :
K
b
(
N
H
4
O
H
)
=
1.8
×
10
−
5
,
l
o
g
1.8
=
0.25
Q.
Calculate the molal elevation constant,
K
b
for water and the boiling of 0.1 molal urea solution. Latent heat of vaporisation of water 9.72 kcal
m
o
l
1
at 373.15K.
Q.
After adding a solute freezing point of water solution decreases to
−
0.186
o
C
. Calculate
Δ
T
b
. (
K
f
=
1.86
o
C
k
g
m
o
l
−
1
and
K
b
=
0.512
o
C
k
g
m
o
l
−
1
)
Q.
Calculate the boiling point of solutions when 2 g of
N
a
2
S
O
4
(
M
=
142
g
m
o
l
−
1
)
is dissolved in 50 g of water, assuming
N
a
2
S
O
4
undergoes complete ionization. (
K
b
for water = 0.52 K kg
m
o
l
−
1
)
Q.
Calculate the boiling point of solution when 4g of
M
g
S
O
4
(
M
=
120
g
m
o
l
−
1
)
was dissolved in 100g of water, assuming
M
g
S
O
4
undergoes complete ionization.
[
K
b
for water =
0.52
K
k
g
m
o
l
−
1
]
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