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- Acid_value abstract "In chemistry, acid value (or "neutralization number" or "acid number" or "acidity") is the mass of potassium hydroxide (KOH) in milligrams that is required to neutralize one gram of chemical substance. The acid number is a measure of the amount of carboxylic acid groups in a chemical compound, such as a fatty acid, or in a mixture of compounds. In a typical procedure, a known amount of sample dissolved in organic solvent (often isopropanol), is titrated with a solution of potassium hydroxide with known concentration and with phenolphthalein as a color indicator.The acid number is used to quantify the amount of acid present, for example in a sample of biodiesel. It is the quantity of base, expressed in milligrams of potassium hydroxide, that is required to neutralize the acidic constituents in 1 g of sample.Veq is the volume of titrant (ml) consumed by the crude oil sample and 1 ml of spiking solution at the equivalent point, beq is the volume of titrant (ml) consumed by 1 ml of spiking solution at the equivalent point, and 56.1 is the molecular weight of KOH. WOil is the mass of the sample in grams.The molar concentration of titrant (N) is calculated as such:In which WKHP is the mass (g) of KHP in 50 ml of KHP standard solution, Veq is the volume of titrant (ml) consumed by 50 ml KHP standard solution at the equivalent point, and 204.23 is the molecular weight of KHP.There are standard methods for determining the acid number, such as ASTM D 974 and DIN 51558 (for mineral oils, biodiesel), or specifically for Biodiesel using the European Standard EN 14104 and ASTM D664 are both widely utilised worldwide.Acid number (mg KOH/g oil) for biodiesel should to be lower than 0.50 mg KOH/g in both EN 14214 and ASTM D6751 standard fuels. This is since the FFA produced may corrode automotive parts and these limits protect vehicle engines and fuel tanks.As oil-fats rancidify, triglycerides are converted into fatty acids and glycerol, causing an increase in acid number. A similar observation is observed with biodiesel aging through analogous oxidation processes and when subjected to prolonged high temperatures (ester thermolysis) or through exposure to acids or bases (acid/base ester hydrolysis).".
- Acid_value wikiPageID "1786925".
- Acid_value wikiPageRevisionID "601852109".
- Acid_value hasPhotoCollection Acid_value.
- Acid_value subject Category:Analytical_chemistry.
- Acid_value subject Category:Lipids.
- Acid_value comment "In chemistry, acid value (or "neutralization number" or "acid number" or "acidity") is the mass of potassium hydroxide (KOH) in milligrams that is required to neutralize one gram of chemical substance. The acid number is a measure of the amount of carboxylic acid groups in a chemical compound, such as a fatty acid, or in a mixture of compounds.".
- Acid_value label "Acid value".
- Acid_value label "Acidez".
- Acid_value label "Indice d'acide".
- Acid_value label "Liczba kwasowa".
- Acid_value label "Numero di acidità".
- Acid_value label "Säurezahl".
- Acid_value label "Zuurgetal".
- Acid_value label "Кислотное число".
- Acid_value label "رقم حمضي".
- Acid_value label "酸価".
- Acid_value label "酸值".
- Acid_value sameAs Säurezahl.
- Acid_value sameAs Acidez.
- Acid_value sameAs Indice_d'acide.
- Acid_value sameAs Numero_di_acidità.
- Acid_value sameAs 酸価.
- Acid_value sameAs Zuurgetal.
- Acid_value sameAs Liczba_kwasowa.
- Acid_value sameAs m.05ww0t.
- Acid_value sameAs Q907280.
- Acid_value sameAs Q907280.
- Acid_value wasDerivedFrom Acid_value?oldid=601852109.
- Acid_value isPrimaryTopicOf Acid_value.