How to Standardize a pH Meter

Written by gabriel dockery
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The standardisation of a pH meter is important to ensure that the readings returned from that meter are accurate. Digital & analogue pH meters offer calibration buttons or dials that are used to adjust the sensitivity of the meter. Over the course of standard usage, laboratory equipment, such as a pH meter, loses accuracy and requires standardisation. Standardisation should be performed regularly.

Skill level:
Moderate

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Things you need

  • Standardisation solutions (solutions of known pH)
  • De-ionised water
  • Paper towels

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Instructions

  1. 1

    Place the reading end of the pH meter into a standardised solution.

  2. 2

    Compare the reading on the meter with the known pH of the solution.

  3. 3

    Use the calibration buttons to change the reading on the meter until it matches that of the standardised solution.

  4. 4

    Rinse the reading end of the pH meter generously with the ionised water and dry with paper towels.

  5. 5

    Repeat this process with several standardised solutions to ensure the accuracy of the pH meter.

Tips and warnings

  • When selecting standardisation solutions, it is important to select both basic and acidic solutions. This ensures that both ends of the reading spectrum are properly calibrated.
  • It is important to thoroughly rinse and dry the reading end of the pH meter between readings. This ensures that the standardisation solutions are not contaminated and prevents erroneous readings.

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