pH Meter Calibration
10 Comments


The pH meter is an important lab instrument
used for measuring the acidity or alkalinity of a liquid. It must be calibrated before each use to ensure
accurate readings. Let’s do a 3-point calibration First, we need to purge the pH meter to erase
the previous calibration. Press the Setup key twice. Press Enter to clear the previous calibration. Now the pH meter is ready to be calibrated. We need 3 known standards. A Neutral – 7.0 Acidic – 4.0 And a Basic 10.0 standard buffer solution. Remove the probe from the storage solution
and rinse with de-ionized water. Carefully blot the bottom of the glass bulb
with a kimwipe. Next, place the probe into the beaker containing
the 4.0 standard buffer solution. Once the Stable icon appears, press the Standardize
key. The display on the pH meter should read 4.00,
but a range of plus or minus 0.05 is acceptable. Remove the probe and rinse it with the de-ionized
water. Carefully blot the bottom of the glass bulb. Now place the probe into the 7.0 standard
buffer solution. Press the Standardize key. Remove the probe and rinse it with the de-ionized
water. Carefully blot the bottom of the glass bulb. Now place the probe into the 10.0 standard
buffer solution. Press the Standardize key. Remove the probe and rinse it with de-ionized
water. Dry the glass bulb and place it back into
the storage solution. Now we have completed our 3-point calibration. In doing so, we have trained the pH meter
to perform accurate measurements using 3 standard buffer solutions. Now the pH meter is ready to be used for a
lab experiment.

10 thoughts on “pH Meter Calibration

  1. Just a couple comments/suggestions- The background music was unnecessary and a bit distracting. Also, the link to the virtual pH calibration lab probably should have gone towards the end after the video was watched rather than at the beginning. But that's just my opinion. 🙂

  2. can i store the buffer solutions that i used for calibration into new calibration and reused it. please answer me. thanks

  3. You should mention that liquid-filled (rather than gel filled) electrodes require that a plug or collar be opened at the top of the electrode to allow for the fluid inside to drain effectively through the salt bridge.  It is also important the the salt bridge be submerged in the solution.

  4. So im having an issue every few measurements. It will read stable for 2-10 seconds then drop .02 and then immediately say stable but it will continue this for up to 15 or 20 min if I let it go and can drop over 1 in that time. Anyone have this problem?

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