The resistances of a series of aqueous NaCI solutions, formed by successive dilution of a sample, were measured in a cell with cell constant (the constant C in the relation κ = C/R) equal to 0.2063 cm-1. The following values were found: c/(mol dm-3) 0.00050 0.0010 0.0050 0.010 0.020 0.050R/Ω 3314 1669 342.1 172.5 89.08 3714(a) Verify that the molar conductivity follows the Kohlrausch law and find the limiting molar conductivity. (b) Determine the coefficient κ, (c) Use the value of κ (which should depend only on the nature, not the identity of the ions) and the information that λ(Na+) = 5.01 mS m2 mol-1 and , λ(I-) = 768 mS m2 mol-1, to predict (i) the molar conductivity, (ii) the conductivity,(iii) the resistance it would show in the cell, of 0.010 mol dm-3 Nal(aq) at 25 °C.
The resistances of a series of aqueous NaCI solutions, formed by successive dilution of a sample, were measured in a cell with cell constant (the constant C in the relation κ = C/R) equal to 0.2063 cm-1. The following values were found:
c/(mol dm-3) 0.00050 0.0010 0.0050 0.010 0.020 0.050
R/Ω 3314 1669 342.1 172.5 89.08 3714
(a) Verify that the molar conductivity follows the Kohlrausch law and find the limiting molar conductivity. (b) Determine the coefficient κ, (c) Use the value of κ (which should depend only on the nature, not the identity of the ions) and the information that λ(Na+) = 5.01 mS m2 mol-1 and , λ(I-) = 768 mS m2 mol-1, to predict (i) the molar conductivity, (ii) the conductivity,
(iii) the resistance it would show in the cell, of 0.010 mol dm-3 Nal(aq) at 25 °C.
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