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Do you analyze the acid number of petroleum products by potentiometric titration? Do you have issues with the reproducibility of your results? My name is Julian Opel. In this first part of this tutorial, Iwill give you four tips focusing on thecleaning of the electrode. This will help you to improve the accuracy and reproducibility of your results. Your results depend very much on your electrode and how you handle it. Correct cleaning of your electrode is very important. So lets have a look at the most important points regarding cleaning. So here is my first tip, for proper cleaning dip rinse your electrode. Rinsing with awash bottle is usually not enough to remove the sample. Dip-rinsing means, immerse your electrode in a beaker filled with solvent and keep stirring for one to three minutes. After this, do not forget to place the glass membrane, and the glass membrane only, in deionized water to recondition it. Make sure thatconditioning time is long enough. In