How to Calculate Different Parameters of a Solution at an Electrode – Part 2

Conductivity or specific conductance (κ) of an electrolyte solution is a measure of its ability to conduct electricity.


Conductivity measurements routinely have many industrial and environmental applications as a quick, cheap and reliable way of measuring the ionic content in a solution. For one, the measurement of product conductivity is a typical way to continuously monitor and trend the water purification systems performance.

Conductivity is linked directly to the total dissolved solids (TDS) in many instances.

When concentration approaches zero, the molar conductivity is known as limiting molar conductivity.

The equilibrium constant of a chemical reaction is the value of its reaction quotient at chemical equilibrium. For acids/bases, it is known as dissociation constant.

Question:

The conductivity of 0.001028 mol L–1 Acetic acid is 4.95 × 10–5 S cm–1. Calculate its dissociation constant if Λ0(m) for Acetic acid is 390.5 S cm2 mol–1.

Solution:



Click/tap to enlarge the image

Λm = Molar conductivity, κ = Conductivity, c = Concentration, α = Degree of dissociation, Λ0(m) = Limiting molar conductivity, K = Dissociation constant

Erudite in electrochemistry❓ Let Chemaficionado know in the comments below or at mychemistryhomework@gmail.com❗

References:

‌(1)    Ncert. Chemistry : Textbook for Class XII - Part.I; National Council Of Educational Research And Training: New Delhi.

(2)    Brown, C.; Ford, M. Higher Level Chemistry, 2nd ed.; Pearson Education: Harlow, Essex, 2014.

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