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    Home > Biochemistry News > Biotechnology News > Determination of acid values.

    Determination of acid values.

    • Last Update: 2020-10-24
    • Source: Internet
    • Author: User
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    related topics .
    , the purpose of the experiment
    .1. Master the principle and method of acid value determination.
    2. To deepen the understanding of the properties of oil oxidation fission., the experimental principle
    acid value is one of the indicators to evaluate the degree of acid failure of oils. It is defined as the mass of 1g fat free fatty acids that consume potassium hydroxide
    of fat. Due to the meso-reaction between free fatty acids in the grease and KOH, the amount of free fatty acids from the KOH standard solution
    be calculated.
    reactions are: RCOOH and KOH -- → RCOOK and H2O . Third, instruments and
    reagents
    instruments
    electronic heating
    constant temperature
    water bath pot, electronic analysis
    balance
    ,
    cans
    2 50mL (×2),
    titring tube
    (acid) 50mL (×1), (alkali
    ) 50mL (×1).
    reagents
    .1. Neutral alcohol ether mixture: take 95% ethanol (chemical purity (C . P) and ether (C.F.) Mix by 1:1 equal volume; or benzene mixture: benzene (C.P.) Mixed with 95% ethanol (C.P) and other volumes; the mixture is added to the number of drops of phenolic indentants, and is mediumed to red in a 0.1mol/LKOH solution.
    2. 1% phenolic indicator: 70% to 90% ethanol preparation.
    3. 0.1mol/LKOH standard solution.4, operating stepsis indeed said to take grease 1 to 5.000g in 100mL triangular burner, take another triangulation bottle without grease as blank, add mixed solution 50 mL in two bottles, shake solution (solid fat must be melted in the water bath and then add mixed solution) or 40 degrees C water bath melting transparent. Add human phenol phenolic indicator 1 to 2 drops, with 0.1moL/L KoH standard drop (KOH concentration depends on the degree of fatty acid failure) to light red 1min does not fade as the end point. Record 0.1mol/LKOH dosing.
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