Qualification and calibration of pH meter

Which of the most common cause of error in pH measurement.

• Viscosity

• Temperature

• Pressure

What is the full form of ATC

• Automatic Temperature Compensation

• Automatic Time Compensation

• Automatic Temperature Corrections

• None of these

The slope of electrode is temperature dependent. The unit of slope is

• pH/mV

• mV/pH

• mV/pH. Deg C

• pH/mV. Deg C

During pH measurement, the acceptable drift of electrode is

• 0.1 unit / min

• 0.15 unit / min

• 0.05 unit / min

• 0.25 unit / min

For the measurement of pH a non aqueous solution, the reference electrode electrolyte is

• LiCl in ethanol

• LiCl in acetic acid

• CaCl2 in ethanol

• Nacl in water

Which of the following solution (s) are required for cleaning of pH meter electrode.

• 0.1 M HNO3

• 0.1 M HCl

• 0.1 M NaOH

• propanol

During calibration of pH meter, sometimes, the slope can not be adjusted. The reason(s) may be

• Blockage of diaphragm

• Use of wrong order of buffer solution

• setting of higher temperature

For storage more than 1 week, the pH meter should be stored

• in storage solution

• dry

After analysing an ointment sample, an electrode be cleaned with

• 0.1 M NaOH

• 0.1 M HCl

• Ethanol

• Acetone

pH meter is a specialized

• ammeter

• voltmeter

• rota-meter