7. To determine the concentration of HF, the dependence of the electrical conductivity (ϰo) on the acid content (C) in the solution is used:
С, mol/l 0.004 0.007 0.015 0.030 0.060 0.121 0.243
ϰo ⋅104 , Ohm−1 ⋅ cm−1 2.5 3.8 5.0 8.0 12.3 21.0 36.3

Build a calibration plot lgϰ = f (logC) from these data and use it to determine the concentration of HF if the specific electrical conductivity of the solution is equal to:
option number 7
ϰo ⋅104 , Ohm−1⋅cm−1 19.3

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