Question

Describe the procedure for two point buffer solution (pH 4 and pH 7) calibration of a pH meter. 

Answer 1

Calibration is done by using known values.We have pH 7 buffer.When we keep the pH meter electrode in pH=7 solution,the pH meter shows a point,we can term that a pH 7 point .

The same way keep electrode in PH 4 buffer solution and mark the point shown by the pH meter as pH 4.Now we can divide the 4-7 into three equal parts ,and subdivisions.Hence calibration is done.

TeNo point caliberation procedure 1, Rise +be electrode coith distilled water and Clean it with a tissue paper. Place the electrode in a pH=7 buffer solution. 3. Wait the meter to stabilize , then adjust the meter cantil it reads a pH of 7. 4. Remove the electrode and sinse it and suns coith electrode distilled water. 5. place the electrode in the pH = 4 buffer solution 6. Wait a moment for the meter to stabilize 1. then adiust the meter until it displays pH=4 7. Remove the electrode and sinse g. Replace the electrode in pH = 7 louffer. If reading does not return to 7, then gepeat Caliberation paocte procedure from 1 to 7.