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12th/Chemistry
Electrochemistry
Question :
The conductivity of 0.20M solution of KCl at 298K is 0.0248 S cm‾¹. Calculate its molar conductivity
Answer :
★ The inverse of resistivity (ρ) is called conductivity or specific conductance (k)
- SI unit : S m‾¹
ATQ, k = 0.0248 S cm‾¹
∴ k = 0.000248 S m‾¹
★ Molar conductivity (λm) is the the conductance of a solution containing 1 mole of the electrolyte.
- λm = k × 1000/Molarity
⭆ λm = k × 1000/M
⭆ λm = 0.000248 × 1000/0.20
⭆ λm = 0.248/0.20
⭆ λm = 1.24 S m²/mol
Cheers!
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