This table presents recommended electrical conductivity (κ) values for aqueous potassium chloride solutions with molalities of 0.01 mol kg-1, 0.1 mol kg-1, and 1.0 mol kg-1 at temperatures from 0 °C to 50 °C. The values, which are based on measurements at the National Institute of Standards and Technology, provide primary standards for the calibration of conductivity cells. The measurements at 0.01 and 0.1 molal are described in Ref. 1, while those at 1.0 molal are in Ref. 2. Temperatures are given on the ITS-90 scale. The uncertainty in the conductivity is about 0.03% for the 0.01 molal values and about 0.04% for the 0.1 and 1.0 molal values.
Column definitions for the table are as follows.
Conductivity values in the last column were subtracted from the original measurements to give the values in the preceding columns for KCl (aq).
The assistance of Kenneth W. Pratt is appreciated.
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