Part of JPC-03 — Electrochemistry: Nernst, Conductance & Cells

Conductance and Molar Conductivity

by Notetube Officialconcept_overview summary99 words4 views

wordcountword_{count}: 200

Conductance G = 1/R (Siemens). Conductivity kappa = G * cellconstantcell_{constant} Scm\frac{S}{cm}. Molar conductivity LambdamLambda_m = kappa * 1000/C (S.cm2cm^2/mol). Upon dilution: kappa decreases (fewer ions per cm3cm^3), but LambdamLambda_m increases (more dissociation per mole). For strong electrolytes, LambdamLambda_m increases linearly with decreasing sqrt(C) — Debye-Huckel-Onsager equation. Lambda_m_{infinity} is found by extrapolation. For weak electrolytes, LambdamLambda_m increases sharply near infinite dilution — cannot extrapolate. Use Kohlrausch's law. Degree of dissociation: alpha = \frac{Lambda_m}{Lambda_m_infinity}. Combined with Ostwald's dilution law: Ka = C*alpha^21alpha\frac{2}{1-alpha}. H+ (349.6) and OH- (198) have anomalously high ionic conductivities due to the Grotthuss proton-hopping mechanism.

Want to generate AI summaries of your own documents? NoteTube turns PDFs, videos, and articles into study-ready summaries.

Sign up free to create your own