Which of the following statements is correct?
Select one:
a. One of the parts of the pH meter is universal indicator
b. PH meters are only used when working with weak acids
c. One of the parts of the pH meter is the electrode for detecting
the chloride ion.
d. In the case of weak acids, the values that are chosen from the
buffers are between pH 8 to pH 14
e. In the case of weak acids, start the calibration with a buffer
value of 4