Question

Answer: The equivalent conductance of ( B a C l_{2} ) is 279 ohm ( ^{-1} mathrm{cm}^{2} mathrm{mol}^{-1} )
Explanation: To calculate the equivalent conducatnce at infinite dilution, we use the formula:
( Lambda_{e q}^{infty}=lambda_{c}^{o}+lambda_{a}^{o} )
For ( B a C l_{2} ), the equivalent conductance will be:
( Lambda_{e q}^{infty}=lambda_{B a^{2}+}^{o}+2 lambda_{C l^{-}}^{o} )
We are given:
( lambda_{B a^{2+}}^{o}=127 mathrm{ohm}^{-1} mathrm{cm}^{2} mathrm{mol}^{-1} )
( lambda_{C l^{-}}^{o}=76 mathrm{ohm}^{-1} mathrm{cm}^{2} mathrm{mol}^{-1} )
Putting values in above equation, we get:
( Lambda_{e q}^{infty}=[127+2(76)] o h m^{-1} c m^{2} m o l^{-1}=279 o h m^{-1} c m^{2} m o l^{-1} )
The equivalent conductance of ( B a C l_{2} ) is 279 oh ( m^{-1} mathrm{cm}^{2} mathrm{mol}^{-1} )

# (4) 4. Red lilyutive Equivalent conductances of Ba2+ and Clions are 127 and 76 ohm-1 cm2 eq-1 respectively. Equivalent conductance of BaCl, at infinite dilution is in the unit ohm-1 cm2 eq-1) (1) 139.5 (2) 101.5 (4) 279 (3) 203

Solution