In the laboratory quality control of a pharmaceutical industry, 3 saline samples needed to be analyzed. An analytical curve was prepared, generating the graph shown below. The readings for each sample were 13.41 mS/cm, 22.92 mS/cm and 10.50 mS/cm.
a) Determine the concentration of the samples.
b) Which of the conductivity readings is not in accordance with the analytical procedure? What needs to be done to quantify the NaCl concentration in this sample?
c) In order to generate the analytical curve, was it necessary to calibrate the system with a standard KCl solution? Explain.
$k = 0,72533 + 14,100 [NaCl]$
$r^2 = 0,99936$