Answer to Question #163314 in Chemistry for yara

Question

what is the ph calibration curve and how it’s done?

Answer 1

The pH calibration curve is a conversion that the pH meter uses to convert the electrode signal in mV to pH. To calibrate pH measuring systems it is required to use a solution with a known pH value, also known as pH reference. The procedure requires the use of several calibration solutions with different pH. A multipoint calibration is accomplished with three or more reference pH calibration solutions. The difference between pH solutions should be greater than 0.5 pH units. The pH electrode calibration curve is determined by either linear regression through all measuring points or built from segments between neighbored buffers in which the zero point and transconductance can be calculated.