To evaluate accuracy and precision, using a calibration check, a solution of 75.0 μM CSA was prepared and run five times. The following responses were recorded: 638411, 642311, 635383, 637833, 641111 ion counts.
• Convert each of the responses to a concentration.
I don't know how to convert the responses to a concentration. Can you please tell me how as I don't even recognize the unit of measurement?