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 K= C/R) equal to 0.2063 cm-I The following values were found:

Verify that the molar conductivity follows the Kohlrausch law and find the limiting molar conductivity. Determine the coefficient '1(. Use the value of '1((which should depend only on the nature, not the identity of the ions) and the information that A(Na+) = 5.01 mS m? mol-l and A(n = 7.68 mS m2 mol3 to predict

(a) The molar conductivity,

(b) The conductivity,

(c) The resistance it would show in the cell, of 0.010 mol dm3 NaI(aq) at 25°C.

Transcribed Image Text:

c/(mol dm-³) R/Ω 0.00050 0.0010 3314 1669 0.0050 0.010 0.020 342.1 174.1 89.08 0.050 37.14