Molar comductivity of NH4Cl, NaOH and NaCl at infinite dilution is 129.0, 217.0 and 106.8 ohm^-1cm^2mol^-1 respectively. Calculate the lambda(NH4OH).
If molar conductivity of 10^-2M NH,OH is 9.4
ohm^-1cm^-2mol^-1, calculate its degree of dissociation
and dissociation constant.
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Answer:
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Explanation:
ANSWER
Λ
m
∞
NH
4
OH=?
Λ
m
∞
(NH
4
Cl)=149.7 Ω
−1
cm
2
mol
−1
Λ
m
∞
(NaOH)=248.1 Ω
−1
cm
2
mol
−1
Λ
m
∞
(NaCl)=126.5 Ω
−1
cm
2
mol
−1
Λ
m
∞
(NH
4
Cl)=Λ
NH
4
+
∞
+Λ
Cl
−
∞
=149.7.....(i)
Λ
m
∞
NaOH=Λ
Na
+
∞
+Λ
OH
−
∞
=248.1.....(ii)
Λ
m
∞
NaCl=Λ
Na
+
∞
+Λ
Cl
−
∞
=126.5.....(iii)
Add equation (i) and (ii) and subtract equation (iii)
Λ
m
∞
NH
4
OH=Λ
NH
4
Cl
∞
+Λ
NaOH
∞
−Λ
NaCl
∞
=Λ
NH
4
+
∞
+Λ
OH
−
∞
=149.7+248.1−126.5
Λ
m
∞
NH
4
OH=271.3 Ω
−1
cm
2
mol
−1
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