ChemLab: Techniques



Flasks, Beakers, & Graduated Cylinders



Volumetric Flasks


Analytical Balance

pH Meter: Analog

pH Meter: Digital

Spectrometer: Analog

Spectrometer: Digital

Spectrometer: Scanning

Top-loading Balance




Quantitative Transfer


Vacuum Filtration

ChemLab Home

pH Meter

A pH meter uses an electrode to measure the pH of a solution.

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Calibrating a pH Meter
Image 1
Remove bottle with storage solution, rinse electrode, blot dry.
Image 2
Measure pH of 4 buffer, which is pink.
Image 3 Image Holder

Adjust meter to read 4 with Cal 1 knob on left.

Image 4
Remove pH 4 buffer, rinse electrode, blot dry.
Image 5
Measure pH of 10 buffer, which is blue.
Image 6 Image 7

Adjust meter to read 10 with Cal 2 knob on right.

Image 8
Remove pH 10 buffer, rinse electrode, blot dry.

Measure pH of 4 buffer again. pH should read 4. If not, readjust Cal 1 knob.

Return to pH 10 buffer. pH should read 10. If not, readjust Cal 2 knob.

Repeat the standardization using the Cal 1 knob with the pH 4 buffer and the Cal 2 know with the pH 10 buffer until consistent readings are obtained.

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