Briefly explain the differences and the similarities on the use of Kohlrausch's equation and Ostwald's dilution law. Give the relevant equations, state what the applications have in common, and in what aspects the applications differ. (8) (b) Conductivity κ of a strong electrolyte is found to vary with concentration. However, ions of strong electrolytes behave independently in the limit of zero concentration. Therefore, the limiting molar conductivity of any strong electrolyte can be predicted. (i) Justify the statement “The conductivity (κ) of a strong electrolyte varies with concentration.” (1) (ii) Define the concept 'limiting molar conductivity' and describe which quantities must be measured in order to determine it. (1)
Question 3 [15]
(a) Briefly explain the differences and the similarities on the use of Kohlrausch's
equation and Ostwald's dilution law. Give the relevant equations, state what the
applications have in common, and in what aspects the applications differ.
(8)
(b) Conductivity κ of a strong electrolyte is found to vary with concentration. However,
ions of strong electrolytes behave independently in the limit of zero concentration.
Therefore, the limiting molar conductivity of any strong electrolyte can be predicted.
(i) Justify the statement “The conductivity (κ) of a strong electrolyte varies
with concentration.” (1)
(ii) Define the concept 'limiting molar conductivity' and describe which quantities must
be measured in order to determine it. (1)
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