Chemistry

Electrochemistry

Electrochemistry



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Calculation of Hittorf's transfer numbers

The table shows the balance for monovalent ions (charge transport 1 F.).

Changes in concentration in a transfer cell

Tab. 1
Calculation of Hittorf's transfer figures using accounting
occurrenceCathode compartmentMiddle roomAnode compartment
Electrode reaction1mol Cations1mol Anions
immigration+t+mol Cationst+ Cations,t Anions+tmol Anions
emigrationt Anionst+ Cations, t Anionst+mol Cations
Change in concentration when passing through 1 F.1t+mol Cationstmol Anions = tmol Cations tmol Anions = t electrolyte1tmol Cations t+mol Anions = t+mol Cations t+mol Anions = t+ electrolyte

The transfer numbers can be calculated from the decrease in concentration, and the ionic conductivities can be calculated from the transfer numbers.

Molar ionic conductivities

Tab. 2
Molar ionic conductivities at infinite dilution at 298 K.
ionH+OHLi+F.N / A+ClK+BrRb+I.Cu2+
Λ0Ω1cm2mol-13501993955507673787877113

The mobility can then be calculated from the ionic conductivities.

Ion mobilities

Tab. 3
Ion mobilities in aqueous solution at 298 K.
substanceu+u
HCl0,820,18
LiCl0,340,66
N / ACl0,400,60
KCl0,500,50
KOH0,280,72


Video: Introduction to electrolysis. Redox reactions and electrochemistry. Chemistry. Khan Academy (August 2022).