BSC1011 Lab Study Guide
How to Calibrate and Use the pH Meter

Type your email address in the space provided.

Type your full name in the space provided.

Terms to Know in This Chapter:

Mettler Toledo [MET ler] [toe LEE doe]

pH

conductivity [con duck TIVE eh tee]

ion

electrode [ee LECK trode]

measure - reference electrode

temperature compensation

electrode stand

automatic temperature compensation probe

two point calibration

buffer group

buffer pack

distilled water

calibrate

calibrate key

read key

ph/mv key

buffer group key

MTC key

What You Need to Know:

You should be able to:

1. assemble and disassemble the pH meter,
2. recognize and know the function of the various key pads on the digital meter.
3. perform a two point calibration of your pH meter and then read the pH of a solution, and
4. explain the significance of the automatic temperature compensation probe.
   

Exercises: Fill in the Blank.

1. Your pH meter is capable of point calibrations; however, in most cases, you will perform point calibrations.
2. You should begin the calibration of your pH meter by placing the automatic temperature compensation probe (ATC) in a solution of deionized water and then press the button.
3. The second step in calibration is to select the fixed and then press the key.
4. The key shows a series of three containers and by pressing the key, you can toggle between selections of buffers.
5. If you choose B2 at 25C, what are the five buffers from which you might choose to do a two point calibration?
6. How do you know the calibration has stabilized when calibrating the meter? (The text will scroll.)
7. Why should you always replace the plastic cap with liquid over the end of the probe before putting the pH meter away? (Text will scroll.)

Exercises: Multiple Choice. Select the Best Answer.

1. Which key allows you to select the buffer calibration group?
   (1) 1
   (2) 2
   (3) 3
   (4) 4
   (5) 5
2. When first beginning the calibration, you should use the _____ button with deionized water.
   (1) read
   (2) ph/mv
   (3) buffer group
   (4) calibrate
   (5) temperature
3. Has the meter shown below stabilized?
   (1) yes
   (2) no
   
4. At 25C, which buffer should you not calibrate the meter?
   (1) 7.00
   (2) 4.01
   (3) 11.00
   (4) 9.0
   (5) 9.18
5. If the buffer choices available are 7.00, 4.00, 10.01, and 1.68, which buffer group should you select?
   (1) B1
   (2) B2
   (3) B3
   (4) B4
   (5) none of the above