Potassium hydroxide solution in methanol

Acid Value Determination

The acid number characterises the acidic components of the fats. For this purpose, the sample is dissolved in a solvent and titrated against phenolphthalein with potassium hydroxide solution. Only free fatty acids are recorded. The fatty acids bound in the glycerides are not determined.

A volumetric standard solution is a solution containing a precisely known concentration of a substance. The concentration of a volumetric standard solution is determined using a primary standard, which is accurately weighed and dissolved to make a specific volume. Volumetric standard solutions are made using reagent-grade (p.a.) substances as source materials.

The advantages of this over making them yourself are:

• Manufactured and tested using modern manufacturing and analytical methods
• Ready-to-use solutions
• High accuracy for precise analyses
• Application of NIST-certified reference substances for checking
• Connection to standard titrators is possible

Titer details: Many of our standard solutions also provide the corresponding titer details in the specification and on the certificate of analysis, in addition to the amount of substance concentrations. If no information is provided, the maximum percentage deviation of the titre corresponds to the specified range of variation in the concentration of the substance. Example: Amount of substance concentration 0,1 mol/l ±0,2 %
It follows that the titer is 1 ±0,2 %, i.e. 0,998-1,002. We recommend the regular checking of the titer prior to application for opened products.