Related Experiment Video
Updated: Jun 28, 2026

Determination of Carbonyl Functional Groups in Bio-oils by Potentiometric Titration: The Faix Method
Published on: February 7, 2017
pH-Metric method for acid number determination in hydraulic oils without titration
E Strochkova1, Y I Tur'yan, I Kuselman
1The National Physical Laboratory of Israel, Givat Ram, Jerusalem 91904, Israel.
Abstract:
A heptane-mediated extraction of acids from hydraulic oils is proposed for pH-metric acid number determination without titration. The acids are extracted in the reagent consisting of triethanolamine and potassium nitrate dissolved in water and isopropanol. The use of heptane allows us to overcome the influence of additives in the hydraulic oil on the glass electrode. Simultaneously the extraction of acids from the oil into the water-isopropanol phase is simplified. The method is validated and suitable metrological characteristics of the acid number determination are obtained.
More Related Videos
Related Concept Videos
Titration Calculations: Weak Acid - Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
Titration of a Weak Acid with a Strong Base
Composition of Polyprotic Acid Solutions as a Function of pH
A graph with the alpha values is plotted against the volume of base added during titration. Here, a...
pH
Titration of a Weak Base with a Strong Acid
Using the ICE table and substituting the Kb value, we calculate the initial pH of 50 mL of 0.1 M ammonia to be 11.11. Addition of 25 mL of 0.1 M hydrochloric acid to this solution of ammonia results in a buffer with an equal concentration of ammonia and ammonium ions. The pH of this buffer can be calculated by substituting these...
Solution Composition During Acid/Base Titrations
The α0 and α1 values represent the...

