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Question
A conductivity cell has been calibrated with a 0.01 M, 1 : 1 electrolytic solution (specific conductance (κ = 1.25 × 10−3 S cm−1) in the cell and the measured resistance was 800 Ω at 25°C. The cell constant is, ____________.
Options
10−1 cm−1
101 cm−1
1 cm−1
5.7 × 10−12
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Solution
A conductivity cell has been calibrated with a 0.01 M, 1 : 1 electrolytic solution (specific conductance (κ = 1.25 × 10−3 S cm−1) in the cell and the measured resistance was 800 Ω at 25°C. The cell constant is, 1 cm−1.
Explanation:
R = `ρ. "l"/"A"`
cell constant = `"R"/ρ`
= `κ."R" (1/ρ = κ)`
= 1.25 × 10−3 Ω−1 cm−1 × 800 Ω
= 1 cm−1
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