Alkali blue 6B (C.I. 42765), 25 g
Molar mass (M) 595,72 g/mol
Melting point (mp) >300 °C
CAS No. [1324-76-1]
Dissolve 0.1 g in 100 ml water
excl. VAT. | 25 g per Pack Qty.
Art. No. 5155.2
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Alkali blue 6B (C.I. 42765) p.a.
|Colour conversion||blue - red|
|Handling area pH||9,4 - 14,0|
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Carl ROTH also offers reagents suitable for food analysis.
On the following pages, you will find the determination of
• Nitrogen according to Kjeldahl
and the determination of the
• Iodine value
• Acid value
• Peroxide value
• Saponification value
as well as other determining factors such as
• Hydroxyl value
• Fluoride ions
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.
The saponification value denotes the amount of potassium hydroxide required to neutralise free fatty acids and saponify bound fatty acids. The lower the average molar mass of the fat, the higher the saponification value. The sample is heated under reflux in a defined quantity of ethanolic potassium hydroxide solution and the non-used alkaline solution is titrated with hydrochloric acid.
Indicators and Dyes
Carl ROTH offers many indicators and dyes of high purity, which can be used in special applications.
The hydroxyl value is a measure of the hydroxy group content of organic materials such as paints, resins, polystyrenes, solvents and lipids. It represents the amount in milligrams of potassium hydroxide required to neutralise the quantity of acetic acid that combines on acetylation of one gram of the substance being tested.
|Appearance||Brownish black powder|
|Appearance of solution (0,1 % in H2O)||Dark blue solution|
|Loss on drying (1 h, 110 °C)||≤6 %|
|Transition range||9.4 (blue)-14.0 (red)|